import enum
import errno
from http import client, HTTPStatus
import io
import itertools
import os
import array
import re
import socket
import threading
import warnings

import unittest
from unittest import mock
TestCase = unittest.TestCase

from test import support
from test.support import os_helper
from test.support import socket_helper
from test.support import warnings_helper

support.requires_working_socket(module=True)

here = os.path.dirname(__file__)
# Self-signed cert file for 'localhost'
CERT_localhost = os.path.join(here, 'keycert.pem')
# Self-signed cert file for 'fakehostname'
CERT_fakehostname = os.path.join(here, 'keycert2.pem')
# Self-signed cert file for self-signed.pythontest.net
CERT_selfsigned_pythontestdotnet = os.path.join(here, 'selfsigned_pythontestdotnet.pem')

# constants for testing chunked encoding
chunked_start = (
    'HTTP/1.1 200 OK\r\n'
    'Transfer-Encoding: chunked\r\n\r\n'
    'a\r\n'
    'hello worl\r\n'
    '3\r\n'
    'd! \r\n'
    '8\r\n'
    'and now \r\n'
    '22\r\n'
    'for something completely different\r\n'
)
chunked_expected = b'hello world! and now for something completely different'
chunk_extension = ";foo=bar"
last_chunk = "0\r\n"
last_chunk_extended = "0" + chunk_extension + "\r\n"
trailers = "X-Dummy: foo\r\nX-Dumm2: bar\r\n"
chunked_end = "\r\n"

HOST = socket_helper.HOST

class FakeSocket:
    def __init__(self, text, fileclass=io.BytesIO, host=None, port=None):
        if isinstance(text, str):
            text = text.encode("ascii")
        self.text = text
        self.fileclass = fileclass
        self.data = b''
        self.sendall_calls = 0
        self.file_closed = False
        self.host = host
        self.port = port

    def sendall(self, data):
        self.sendall_calls += 1
        self.data += data

    def makefile(self, mode, bufsize=None):
        if mode != 'r' and mode != 'rb':
            raise client.UnimplementedFileMode()
        # keep the file around so we can check how much was read from it
        self.file = self.fileclass(self.text)
        self.file.close = self.file_close #nerf close ()
        return self.file

    def file_close(self):
        self.file_closed = True

    def close(self):
        pass

    def setsockopt(self, level, optname, value):
        pass

class EPipeSocket(FakeSocket):

    def __init__(self, text, pipe_trigger):
        # When sendall() is called with pipe_trigger, raise EPIPE.
        FakeSocket.__init__(self, text)
        self.pipe_trigger = pipe_trigger

    def sendall(self, data):
        if self.pipe_trigger in data:
            raise OSError(errno.EPIPE, "gotcha")
        self.data += data

    def close(self):
        pass

class NoEOFBytesIO(io.BytesIO):
    """Like BytesIO, but raises AssertionError on EOF.

    This is used below to test that http.client doesn't try to read
    more from the underlying file than it should.
    """
    def read(self, n=-1):
        data = io.BytesIO.read(self, n)
        if data == b'':
            raise AssertionError('caller tried to read past EOF')
        return data

    def readline(self, length=None):
        data = io.BytesIO.readline(self, length)
        if data == b'':
            raise AssertionError('caller tried to read past EOF')
        return data

class FakeSocketHTTPConnection(client.HTTPConnection):
    """HTTPConnection subclass using FakeSocket; counts connect() calls"""

    def __init__(self, *args):
        self.connections = 0
        super().__init__('example.com')
        self.fake_socket_args = args
        self._create_connection = self.create_connection

    def connect(self):
        """Count the number of times connect() is invoked"""
        self.connections += 1
        return super().connect()

    def create_connection(self, *pos, **kw):
        return FakeSocket(*self.fake_socket_args)

class HeaderTests(TestCase):
    def test_auto_headers(self):
        # Some headers are added automatically, but should not be added by
        # .request() if they are explicitly set.

        class HeaderCountingBuffer(list):
            def __init__(self):
                self.count = {}
            def append(self, item):
                kv = item.split(b':')
                if len(kv) > 1:
                    # item is a 'Key: Value' header string
                    lcKey = kv[0].decode('ascii').lower()
                    self.count.setdefault(lcKey, 0)
                    self.count[lcKey] += 1
                list.append(self, item)

        for explicit_header in True, False:
            for header in 'Content-length', 'Host', 'Accept-encoding':
                conn = client.HTTPConnection('example.com')
                conn.sock = FakeSocket('blahblahblah')
                conn._buffer = HeaderCountingBuffer()

                body = 'spamspamspam'
                headers = {}
                if explicit_header:
                    headers[header] = str(len(body))
                conn.request('POST', '/', body, headers)
                self.assertEqual(conn._buffer.count[header.lower()], 1)

    def test_content_length_0(self):

        class ContentLengthChecker(list):
            def __init__(self):
                list.__init__(self)
                self.content_length = None
            def append(self, item):
                kv = item.split(b':', 1)
                if len(kv) > 1 and kv[0].lower() == b'content-length':
                    self.content_length = kv[1].strip()
                list.append(self, item)

        # Here, we're testing that methods expecting a body get a
        # content-length set to zero if the body is empty (either None or '')
        bodies = (None, '')
        methods_with_body = ('PUT', 'POST', 'PATCH')
        for method, body in itertools.product(methods_with_body, bodies):
            conn = client.HTTPConnection('example.com')
            conn.sock = FakeSocket(None)
            conn._buffer = ContentLengthChecker()
            conn.request(method, '/', body)
            self.assertEqual(
                conn._buffer.content_length, b'0',
                'Header Content-Length incorrect on {}'.format(method)
            )

        # For these methods, we make sure that content-length is not set when
        # the body is None because it might cause unexpected behaviour on the
        # server.
        methods_without_body = (
             'GET', 'CONNECT', 'DELETE', 'HEAD', 'OPTIONS', 'TRACE',
        )
        for method in methods_without_body:
            conn = client.HTTPConnection('example.com')
            conn.sock = FakeSocket(None)
            conn._buffer = ContentLengthChecker()
            conn.request(method, '/', None)
            self.assertEqual(
                conn._buffer.content_length, None,
                'Header Content-Length set for empty body on {}'.format(method)
            )

        # If the body is set to '', that's considered to be "present but
        # empty" rather than "missing", so content length would be set, even
        # for methods that don't expect a body.
        for method in methods_without_body:
            conn = client.HTTPConnection('example.com')
            conn.sock = FakeSocket(None)
            conn._buffer = ContentLengthChecker()
            conn.request(method, '/', '')
            self.assertEqual(
                conn._buffer.content_length, b'0',
                'Header Content-Length incorrect on {}'.format(method)
            )

        # If the body is set, make sure Content-Length is set.
        for method in itertools.chain(methods_without_body, methods_with_body):
            conn = client.HTTPConnection('example.com')
            conn.sock = FakeSocket(None)
            conn._buffer = ContentLengthChecker()
            conn.request(method, '/', ' ')
            self.assertEqual(
                conn._buffer.content_length, b'1',
                'Header Content-Length incorrect on {}'.format(method)
            )

    def test_putheader(self):
        conn = client.HTTPConnection('example.com')
        conn.sock = FakeSocket(None)
        conn.putrequest('GET','/')
        conn.putheader('Content-length', 42)
        self.assertIn(b'Content-length: 42', conn._buffer)

        conn.putheader('Foo', ' bar ')
        self.assertIn(b'Foo:  bar ', conn._buffer)
        conn.putheader('Bar', '\tbaz\t')
        self.assertIn(b'Bar: \tbaz\t', conn._buffer)
        conn.putheader('Authorization', 'Bearer mytoken')
        self.assertIn(b'Authorization: Bearer mytoken', conn._buffer)
        conn.putheader('IterHeader', 'IterA', 'IterB')
        self.assertIn(b'IterHeader: IterA\r\n\tIterB', conn._buffer)
        conn.putheader('LatinHeader', b'\xFF')
        self.assertIn(b'LatinHeader: \xFF', conn._buffer)
        conn.putheader('Utf8Header', b'\xc3\x80')
        self.assertIn(b'Utf8Header: \xc3\x80', conn._buffer)
        conn.putheader('C1-Control', b'next\x85line')
        self.assertIn(b'C1-Control: next\x85line', conn._buffer)
        conn.putheader('Embedded-Fold-Space', 'is\r\n allowed')
        self.assertIn(b'Embedded-Fold-Space: is\r\n allowed', conn._buffer)
        conn.putheader('Embedded-Fold-Tab', 'is\r\n\tallowed')
        self.assertIn(b'Embedded-Fold-Tab: is\r\n\tallowed', conn._buffer)
        conn.putheader('Key Space', 'value')
        self.assertIn(b'Key Space: value', conn._buffer)
        conn.putheader('KeySpace ', 'value')
        self.assertIn(b'KeySpace : value', conn._buffer)
        conn.putheader(b'Nonbreak\xa0Space', 'value')
        self.assertIn(b'Nonbreak\xa0Space: value', conn._buffer)
        conn.putheader(b'\xa0NonbreakSpace', 'value')
        self.assertIn(b'\xa0NonbreakSpace: value', conn._buffer)

    def test_ipv6host_header(self):
        # Default host header on IPv6 transaction should be wrapped by [] if
        # it is an IPv6 address
        expected = b'GET /foo HTTP/1.1\r\nHost: [2001::]:81\r\n' \
                   b'Accept-Encoding: identity\r\n\r\n'
        conn = client.HTTPConnection('[2001::]:81')
        sock = FakeSocket('')
        conn.sock = sock
        conn.request('GET', '/foo')
        self.assertTrue(sock.data.startswith(expected))

        expected = b'GET /foo HTTP/1.1\r\nHost: [2001:102A::]\r\n' \
                   b'Accept-Encoding: identity\r\n\r\n'
        conn = client.HTTPConnection('[2001:102A::]')
        sock = FakeSocket('')
        conn.sock = sock
        conn.request('GET', '/foo')
        self.assertTrue(sock.data.startswith(expected))

    def test_malformed_headers_coped_with(self):
        # Issue 19996
        body = "HTTP/1.1 200 OK\r\nFirst: val\r\n: nval\r\nSecond: val\r\n\r\n"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()

        self.assertEqual(resp.getheader('First'), 'val')
        self.assertEqual(resp.getheader('Second'), 'val')

    def test_parse_all_octets(self):
        # Ensure no valid header field octet breaks the parser
        body = (
            b'HTTP/1.1 200 OK\r\n'
            b"!#$%&'*+-.^_`|~: value\r\n"  # Special token characters
            b'VCHAR: ' + bytes(range(0x21, 0x7E + 1)) + b'\r\n'
            b'obs-text: ' + bytes(range(0x80, 0xFF + 1)) + b'\r\n'
            b'obs-fold: text\r\n'
            b' folded with space\r\n'
            b'\tfolded with tab\r\n'
            b'Content-Length: 0\r\n'
            b'\r\n'
        )
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        self.assertEqual(resp.getheader('Content-Length'), '0')
        self.assertEqual(resp.msg['Content-Length'], '0')
        self.assertEqual(resp.getheader("!#$%&'*+-.^_`|~"), 'value')
        self.assertEqual(resp.msg["!#$%&'*+-.^_`|~"], 'value')
        vchar = ''.join(map(chr, range(0x21, 0x7E + 1)))
        self.assertEqual(resp.getheader('VCHAR'), vchar)
        self.assertEqual(resp.msg['VCHAR'], vchar)
        self.assertIsNotNone(resp.getheader('obs-text'))
        self.assertIn('obs-text', resp.msg)
        for folded in (resp.getheader('obs-fold'), resp.msg['obs-fold']):
            self.assertTrue(folded.startswith('text'))
            self.assertIn(' folded with space', folded)
            self.assertTrue(folded.endswith('folded with tab'))

    def test_invalid_headers(self):
        conn = client.HTTPConnection('example.com')
        conn.sock = FakeSocket('')
        conn.putrequest('GET', '/')

        # http://tools.ietf.org/html/rfc7230#section-3.2.4, whitespace is no
        # longer allowed in header names
        cases = (
            (b'Invalid\r\nName', b'ValidValue'),
            (b'Invalid\rName', b'ValidValue'),
            (b'Invalid\nName', b'ValidValue'),
            (b'\r\nInvalidName', b'ValidValue'),
            (b'\rInvalidName', b'ValidValue'),
            (b'\nInvalidName', b'ValidValue'),
            (b' InvalidName', b'ValidValue'),
            (b'\tInvalidName', b'ValidValue'),
            (b'Invalid:Name', b'ValidValue'),
            (b':InvalidName', b'ValidValue'),
            (b'ValidName', b'Invalid\r\nValue'),
            (b'ValidName', b'Invalid\rValue'),
            (b'ValidName', b'Invalid\nValue'),
            (b'ValidName', b'InvalidValue\r\n'),
            (b'ValidName', b'InvalidValue\r'),
            (b'ValidName', b'InvalidValue\n'),
        )
        for name, value in cases:
            with self.subTest((name, value)):
                with self.assertRaisesRegex(ValueError, 'Invalid header'):
                    conn.putheader(name, value)

    def test_headers_debuglevel(self):
        body = (
            b'HTTP/1.1 200 OK\r\n'
            b'First: val\r\n'
            b'Second: val1\r\n'
            b'Second: val2\r\n'
        )
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock, debuglevel=1)
        with support.captured_stdout() as output:
            resp.begin()
        lines = output.getvalue().splitlines()
        self.assertEqual(lines[0], "reply: 'HTTP/1.1 200 OK\\r\\n'")
        self.assertEqual(lines[1], "header: First: val")
        self.assertEqual(lines[2], "header: Second: val1")
        self.assertEqual(lines[3], "header: Second: val2")


class HttpMethodTests(TestCase):
    def test_invalid_method_names(self):
        methods = (
            'GET\r',
            'POST\n',
            'PUT\n\r',
            'POST\nValue',
            'POST\nHOST:abc',
            'GET\nrHost:abc\n',
            'POST\rRemainder:\r',
            'GET\rHOST:\n',
            '\nPUT'
        )

        for method in methods:
            with self.assertRaisesRegex(
                    ValueError, "method can't contain control characters"):
                conn = client.HTTPConnection('example.com')
                conn.sock = FakeSocket(None)
                conn.request(method=method, url="/")


class TransferEncodingTest(TestCase):
    expected_body = b"It's just a flesh wound"

    def test_endheaders_chunked(self):
        conn = client.HTTPConnection('example.com')
        conn.sock = FakeSocket(b'')
        conn.putrequest('POST', '/')
        conn.endheaders(self._make_body(), encode_chunked=True)

        _, _, body = self._parse_request(conn.sock.data)
        body = self._parse_chunked(body)
        self.assertEqual(body, self.expected_body)

    def test_explicit_headers(self):
        # explicit chunked
        conn = client.HTTPConnection('example.com')
        conn.sock = FakeSocket(b'')
        # this shouldn't actually be automatically chunk-encoded because the
        # calling code has explicitly stated that it's taking care of it
        conn.request(
            'POST', '/', self._make_body(), {'Transfer-Encoding': 'chunked'})

        _, headers, body = self._parse_request(conn.sock.data)
        self.assertNotIn('content-length', [k.lower() for k in headers.keys()])
        self.assertEqual(headers['Transfer-Encoding'], 'chunked')
        self.assertEqual(body, self.expected_body)

        # explicit chunked, string body
        conn = client.HTTPConnection('example.com')
        conn.sock = FakeSocket(b'')
        conn.request(
            'POST', '/', self.expected_body.decode('latin-1'),
            {'Transfer-Encoding': 'chunked'})

        _, headers, body = self._parse_request(conn.sock.data)
        self.assertNotIn('content-length', [k.lower() for k in headers.keys()])
        self.assertEqual(headers['Transfer-Encoding'], 'chunked')
        self.assertEqual(body, self.expected_body)

        # User-specified TE, but request() does the chunk encoding
        conn = client.HTTPConnection('example.com')
        conn.sock = FakeSocket(b'')
        conn.request('POST', '/',
            headers={'Transfer-Encoding': 'gzip, chunked'},
            encode_chunked=True,
            body=self._make_body())
        _, headers, body = self._parse_request(conn.sock.data)
        self.assertNotIn('content-length', [k.lower() for k in headers])
        self.assertEqual(headers['Transfer-Encoding'], 'gzip, chunked')
        self.assertEqual(self._parse_chunked(body), self.expected_body)

    def test_request(self):
        for empty_lines in (False, True,):
            conn = client.HTTPConnection('example.com')
            conn.sock = FakeSocket(b'')
            conn.request(
                'POST', '/', self._make_body(empty_lines=empty_lines))

            _, headers, body = self._parse_request(conn.sock.data)
            body = self._parse_chunked(body)
            self.assertEqual(body, self.expected_body)
            self.assertEqual(headers['Transfer-Encoding'], 'chunked')

            # Content-Length and Transfer-Encoding SHOULD not be sent in the
            # same request
            self.assertNotIn('content-length', [k.lower() for k in headers])

    def test_empty_body(self):
        # Zero-length iterable should be treated like any other iterable
        conn = client.HTTPConnection('example.com')
        conn.sock = FakeSocket(b'')
        conn.request('POST', '/', ())
        _, headers, body = self._parse_request(conn.sock.data)
        self.assertEqual(headers['Transfer-Encoding'], 'chunked')
        self.assertNotIn('content-length', [k.lower() for k in headers])
        self.assertEqual(body, b"0\r\n\r\n")

    def _make_body(self, empty_lines=False):
        lines = self.expected_body.split(b' ')
        for idx, line in enumerate(lines):
            # for testing handling empty lines
            if empty_lines and idx % 2:
                yield b''
            if idx < len(lines) - 1:
                yield line + b' '
            else:
                yield line

    def _parse_request(self, data):
        lines = data.split(b'\r\n')
        request = lines[0]
        headers = {}
        n = 1
        while n < len(lines) and len(lines[n]) > 0:
            key, val = lines[n].split(b':')
            key = key.decode('latin-1').strip()
            headers[key] = val.decode('latin-1').strip()
            n += 1

        return request, headers, b'\r\n'.join(lines[n + 1:])

    def _parse_chunked(self, data):
        body = []
        trailers = {}
        n = 0
        lines = data.split(b'\r\n')
        # parse body
        while True:
            size, chunk = lines[n:n+2]
            size = int(size, 16)

            if size == 0:
                n += 1
                break

            self.assertEqual(size, len(chunk))
            body.append(chunk)

            n += 2
            # we /should/ hit the end chunk, but check against the size of
            # lines so we're not stuck in an infinite loop should we get
            # malformed data
            if n > len(lines):
                break

        return b''.join(body)


class BasicTest(TestCase):
    def test_dir_with_added_behavior_on_status(self):
        # see issue40084
        self.assertTrue({'description', 'name', 'phrase', 'value'} <= set(dir(HTTPStatus(404))))

    def test_simple_httpstatus(self):
        class CheckedHTTPStatus(enum.IntEnum):
            """HTTP status codes and reason phrases

            Status codes from the following RFCs are all observed:

                * RFC 7231: Hypertext Transfer Protocol (HTTP/1.1), obsoletes 2616
                * RFC 6585: Additional HTTP Status Codes
                * RFC 3229: Delta encoding in HTTP
                * RFC 4918: HTTP Extensions for WebDAV, obsoletes 2518
                * RFC 5842: Binding Extensions to WebDAV
                * RFC 7238: Permanent Redirect
                * RFC 2295: Transparent Content Negotiation in HTTP
                * RFC 2774: An HTTP Extension Framework
                * RFC 7725: An HTTP Status Code to Report Legal Obstacles
                * RFC 7540: Hypertext Transfer Protocol Version 2 (HTTP/2)
                * RFC 2324: Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0)
                * RFC 8297: An HTTP Status Code for Indicating Hints
                * RFC 8470: Using Early Data in HTTP
            """
            def __new__(cls, value, phrase, description=''):
                obj = int.__new__(cls, value)
                obj._value_ = value

                obj.phrase = phrase
                obj.description = description
                return obj
            # informational
            CONTINUE = 100, 'Continue', 'Request received, please continue'
            SWITCHING_PROTOCOLS = (101, 'Switching Protocols',
                    'Switching to new protocol; obey Upgrade header')
            PROCESSING = 102, 'Processing'
            EARLY_HINTS = 103, 'Early Hints'
            # success
            OK = 200, 'OK', 'Request fulfilled, document follows'
            CREATED = 201, 'Created', 'Document created, URL follows'
            ACCEPTED = (202, 'Accepted',
                'Request accepted, processing continues off-line')
            NON_AUTHORITATIVE_INFORMATION = (203,
                'Non-Authoritative Information', 'Request fulfilled from cache')
            NO_CONTENT = 204, 'No Content', 'Request fulfilled, nothing follows'
            RESET_CONTENT = 205, 'Reset Content', 'Clear input form for further input'
            PARTIAL_CONTENT = 206, 'Partial Content', 'Partial content follows'
            MULTI_STATUS = 207, 'Multi-Status'
            ALREADY_REPORTED = 208, 'Already Reported'
            IM_USED = 226, 'IM Used'
            # redirection
            MULTIPLE_CHOICES = (300, 'Multiple Choices',
                'Object has several resources -- see URI list')
            MOVED_PERMANENTLY = (301, 'Moved Permanently',
                'Object moved permanently -- see URI list')
            FOUND = 302, 'Found', 'Object moved temporarily -- see URI list'
            SEE_OTHER = 303, 'See Other', 'Object moved -- see Method and URL list'
            NOT_MODIFIED = (304, 'Not Modified',
                'Document has not changed since given time')
            USE_PROXY = (305, 'Use Proxy',
                'You must use proxy specified in Location to access this resource')
            TEMPORARY_REDIRECT = (307, 'Temporary Redirect',
                'Object moved temporarily -- see URI list')
            PERMANENT_REDIRECT = (308, 'Permanent Redirect',
                'Object moved permanently -- see URI list')
            # client error
            BAD_REQUEST = (400, 'Bad Request',
                'Bad request syntax or unsupported method')
            UNAUTHORIZED = (401, 'Unauthorized',
                'No permission -- see authorization schemes')
            PAYMENT_REQUIRED = (402, 'Payment Required',
                'No payment -- see charging schemes')
            FORBIDDEN = (403, 'Forbidden',
                'Request forbidden -- authorization will not help')
            NOT_FOUND = (404, 'Not Found',
                'Nothing matches the given URI')
            METHOD_NOT_ALLOWED = (405, 'Method Not Allowed',
                'Specified method is invalid for this resource')
            NOT_ACCEPTABLE = (406, 'Not Acceptable',
                'URI not available in preferred format')
            PROXY_AUTHENTICATION_REQUIRED = (407,
                'Proxy Authentication Required',
                'You must authenticate with this proxy before proceeding')
            REQUEST_TIMEOUT = (408, 'Request Timeout',
                'Request timed out; try again later')
            CONFLICT = 409, 'Conflict', 'Request conflict'
            GONE = (410, 'Gone',
                'URI no longer exists and has been permanently removed')
            LENGTH_REQUIRED = (411, 'Length Required',
                'Client must specify Content-Length')
            PRECONDITION_FAILED = (412, 'Precondition Failed',
                'Precondition in headers is false')
            REQUEST_ENTITY_TOO_LARGE = (413, 'Request Entity Too Large',
                'Entity is too large')
            REQUEST_URI_TOO_LONG = (414, 'Request-URI Too Long',
                'URI is too long')
            UNSUPPORTED_MEDIA_TYPE = (415, 'Unsupported Media Type',
                'Entity body in unsupported format')
            REQUESTED_RANGE_NOT_SATISFIABLE = (416,
                'Requested Range Not Satisfiable',
                'Cannot satisfy request range')
            EXPECTATION_FAILED = (417, 'Expectation Failed',
                'Expect condition could not be satisfied')
            IM_A_TEAPOT = (418, 'I\'m a Teapot',
                'Server refuses to brew coffee because it is a teapot.')
            MISDIRECTED_REQUEST = (421, 'Misdirected Request',
                'Server is not able to produce a response')
            UNPROCESSABLE_ENTITY = 422, 'Unprocessable Entity'
            LOCKED = 423, 'Locked'
            FAILED_DEPENDENCY = 424, 'Failed Dependency'
            TOO_EARLY = 425, 'Too Early'
            UPGRADE_REQUIRED = 426, 'Upgrade Required'
            PRECONDITION_REQUIRED = (428, 'Precondition Required',
                'The origin server requires the request to be conditional')
            TOO_MANY_REQUESTS = (429, 'Too Many Requests',
                'The user has sent too many requests in '
                'a given amount of time ("rate limiting")')
            REQUEST_HEADER_FIELDS_TOO_LARGE = (431,
                'Request Header Fields Too Large',
                'The server is unwilling to process the request because its header '
                'fields are too large')
            UNAVAILABLE_FOR_LEGAL_REASONS = (451,
                'Unavailable For Legal Reasons',
                'The server is denying access to the '
                'resource as a consequence of a legal demand')
            # server errors
            INTERNAL_SERVER_ERROR = (500, 'Internal Server Error',
                'Server got itself in trouble')
            NOT_IMPLEMENTED = (501, 'Not Implemented',
                'Server does not support this operation')
            BAD_GATEWAY = (502, 'Bad Gateway',
                'Invalid responses from another server/proxy')
            SERVICE_UNAVAILABLE = (503, 'Service Unavailable',
                'The server cannot process the request due to a high load')
            GATEWAY_TIMEOUT = (504, 'Gateway Timeout',
                'The gateway server did not receive a timely response')
            HTTP_VERSION_NOT_SUPPORTED = (505, 'HTTP Version Not Supported',
                'Cannot fulfill request')
            VARIANT_ALSO_NEGOTIATES = 506, 'Variant Also Negotiates'
            INSUFFICIENT_STORAGE = 507, 'Insufficient Storage'
            LOOP_DETECTED = 508, 'Loop Detected'
            NOT_EXTENDED = 510, 'Not Extended'
            NETWORK_AUTHENTICATION_REQUIRED = (511,
                'Network Authentication Required',
                'The client needs to authenticate to gain network access')
        enum._test_simple_enum(CheckedHTTPStatus, HTTPStatus)


    def test_status_lines(self):
        # Test HTTP status lines

        body = "HTTP/1.1 200 Ok\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        self.assertEqual(resp.read(0), b'')  # Issue #20007
        self.assertFalse(resp.isclosed())
        self.assertFalse(resp.closed)
        self.assertEqual(resp.read(), b"Text")
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

        body = "HTTP/1.1 400.100 Not Ok\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        self.assertRaises(client.BadStatusLine, resp.begin)

    def test_bad_status_repr(self):
        exc = client.BadStatusLine('')
        self.assertEqual(repr(exc), '''BadStatusLine("''")''')

    def test_partial_reads(self):
        # if we have Content-Length, HTTPResponse knows when to close itself,
        # the same behaviour as when we read the whole thing with read()
        body = "HTTP/1.1 200 Ok\r\nContent-Length: 4\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        self.assertEqual(resp.read(2), b'Te')
        self.assertFalse(resp.isclosed())
        self.assertEqual(resp.read(2), b'xt')
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

    def test_mixed_reads(self):
        # readline() should update the remaining length, so that read() knows
        # how much data is left and does not raise IncompleteRead
        body = "HTTP/1.1 200 Ok\r\nContent-Length: 13\r\n\r\nText\r\nAnother"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        self.assertEqual(resp.readline(), b'Text\r\n')
        self.assertFalse(resp.isclosed())
        self.assertEqual(resp.read(), b'Another')
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

    def test_partial_readintos(self):
        # if we have Content-Length, HTTPResponse knows when to close itself,
        # the same behaviour as when we read the whole thing with read()
        body = "HTTP/1.1 200 Ok\r\nContent-Length: 4\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        b = bytearray(2)
        n = resp.readinto(b)
        self.assertEqual(n, 2)
        self.assertEqual(bytes(b), b'Te')
        self.assertFalse(resp.isclosed())
        n = resp.readinto(b)
        self.assertEqual(n, 2)
        self.assertEqual(bytes(b), b'xt')
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

    def test_partial_reads_past_end(self):
        # if we have Content-Length, clip reads to the end
        body = "HTTP/1.1 200 Ok\r\nContent-Length: 4\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        self.assertEqual(resp.read(10), b'Text')
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

    def test_partial_readintos_past_end(self):
        # if we have Content-Length, clip readintos to the end
        body = "HTTP/1.1 200 Ok\r\nContent-Length: 4\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        b = bytearray(10)
        n = resp.readinto(b)
        self.assertEqual(n, 4)
        self.assertEqual(bytes(b)[:4], b'Text')
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

    def test_partial_reads_no_content_length(self):
        # when no length is present, the socket should be gracefully closed when
        # all data was read
        body = "HTTP/1.1 200 Ok\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        self.assertEqual(resp.read(2), b'Te')
        self.assertFalse(resp.isclosed())
        self.assertEqual(resp.read(2), b'xt')
        self.assertEqual(resp.read(1), b'')
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

    def test_partial_readintos_no_content_length(self):
        # when no length is present, the socket should be gracefully closed when
        # all data was read
        body = "HTTP/1.1 200 Ok\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        b = bytearray(2)
        n = resp.readinto(b)
        self.assertEqual(n, 2)
        self.assertEqual(bytes(b), b'Te')
        self.assertFalse(resp.isclosed())
        n = resp.readinto(b)
        self.assertEqual(n, 2)
        self.assertEqual(bytes(b), b'xt')
        n = resp.readinto(b)
        self.assertEqual(n, 0)
        self.assertTrue(resp.isclosed())

    def test_partial_reads_incomplete_body(self):
        # if the server shuts down the connection before the whole
        # content-length is delivered, the socket is gracefully closed
        body = "HTTP/1.1 200 Ok\r\nContent-Length: 10\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        self.assertEqual(resp.read(2), b'Te')
        self.assertFalse(resp.isclosed())
        self.assertEqual(resp.read(2), b'xt')
        self.assertEqual(resp.read(1), b'')
        self.assertTrue(resp.isclosed())

    def test_partial_readintos_incomplete_body(self):
        # if the server shuts down the connection before the whole
        # content-length is delivered, the socket is gracefully closed
        body = "HTTP/1.1 200 Ok\r\nContent-Length: 10\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        b = bytearray(2)
        n = resp.readinto(b)
        self.assertEqual(n, 2)
        self.assertEqual(bytes(b), b'Te')
        self.assertFalse(resp.isclosed())
        n = resp.readinto(b)
        self.assertEqual(n, 2)
        self.assertEqual(bytes(b), b'xt')
        n = resp.readinto(b)
        self.assertEqual(n, 0)
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

    def test_host_port(self):
        # Check invalid host_port

        for hp in ("www.python.org:abc", "user:password@www.python.org"):
            self.assertRaises(client.InvalidURL, client.HTTPConnection, hp)

        for hp, h, p in (("[fe80::207:e9ff:fe9b]:8000",
                          "fe80::207:e9ff:fe9b", 8000),
                         ("www.python.org:80", "www.python.org", 80),
                         ("www.python.org:", "www.python.org", 80),
                         ("www.python.org", "www.python.org", 80),
                         ("[fe80::207:e9ff:fe9b]", "fe80::207:e9ff:fe9b", 80),
                         ("[fe80::207:e9ff:fe9b]:", "fe80::207:e9ff:fe9b", 80)):
            c = client.HTTPConnection(hp)
            self.assertEqual(h, c.host)
            self.assertEqual(p, c.port)

    def test_response_headers(self):
        # test response with multiple message headers with the same field name.
        text = ('HTTP/1.1 200 OK\r\n'
                'Set-Cookie: Customer="WILE_E_COYOTE"; '
                'Version="1"; Path="/acme"\r\n'
                'Set-Cookie: Part_Number="Rocket_Launcher_0001"; Version="1";'
                ' Path="/acme"\r\n'
                '\r\n'
                'No body\r\n')
        hdr = ('Customer="WILE_E_COYOTE"; Version="1"; Path="/acme"'
               ', '
               'Part_Number="Rocket_Launcher_0001"; Version="1"; Path="/acme"')
        s = FakeSocket(text)
        r = client.HTTPResponse(s)
        r.begin()
        cookies = r.getheader("Set-Cookie")
        self.assertEqual(cookies, hdr)

    def test_read_head(self):
        # Test that the library doesn't attempt to read any data
        # from a HEAD request.  (Tickles SF bug #622042.)
        sock = FakeSocket(
            'HTTP/1.1 200 OK\r\n'
            'Content-Length: 14432\r\n'
            '\r\n',
            NoEOFBytesIO)
        resp = client.HTTPResponse(sock, method="HEAD")
        resp.begin()
        if resp.read():
            self.fail("Did not expect response from HEAD request")

    def test_readinto_head(self):
        # Test that the library doesn't attempt to read any data
        # from a HEAD request.  (Tickles SF bug #622042.)
        sock = FakeSocket(
            'HTTP/1.1 200 OK\r\n'
            'Content-Length: 14432\r\n'
            '\r\n',
            NoEOFBytesIO)
        resp = client.HTTPResponse(sock, method="HEAD")
        resp.begin()
        b = bytearray(5)
        if resp.readinto(b) != 0:
            self.fail("Did not expect response from HEAD request")
        self.assertEqual(bytes(b), b'\x00'*5)

    def test_too_many_headers(self):
        headers = '\r\n'.join('Header%d: foo' % i
                              for i in range(client._MAXHEADERS + 1)) + '\r\n'
        text = ('HTTP/1.1 200 OK\r\n' + headers)
        s = FakeSocket(text)
        r = client.HTTPResponse(s)
        self.assertRaisesRegex(client.HTTPException,
                               r"got more than \d+ headers", r.begin)

    def test_send_file(self):
        expected = (b'GET /foo HTTP/1.1\r\nHost: example.com\r\n'
                    b'Accept-Encoding: identity\r\n'
                    b'Transfer-Encoding: chunked\r\n'
                    b'\r\n')

        with open(__file__, 'rb') as body:
            conn = client.HTTPConnection('example.com')
            sock = FakeSocket(body)
            conn.sock = sock
            conn.request('GET', '/foo', body)
            self.assertTrue(sock.data.startswith(expected), '%r != %r' %
                    (sock.data[:len(expected)], expected))

    def test_send(self):
        expected = b'this is a test this is only a test'
        conn = client.HTTPConnection('example.com')
        sock = FakeSocket(None)
        conn.sock = sock
        conn.send(expected)
        self.assertEqual(expected, sock.data)
        sock.data = b''
        conn.send(array.array('b', expected))
        self.assertEqual(expected, sock.data)
        sock.data = b''
        conn.send(io.BytesIO(expected))
        self.assertEqual(expected, sock.data)

    def test_send_updating_file(self):
        def data():
            yield 'data'
            yield None
            yield 'data_two'

        class UpdatingFile(io.TextIOBase):
            mode = 'r'
            d = data()
            def read(self, blocksize=-1):
                return next(self.d)

        expected = b'data'

        conn = client.HTTPConnection('example.com')
        sock = FakeSocket("")
        conn.sock = sock
        conn.send(UpdatingFile())
        self.assertEqual(sock.data, expected)


    def test_send_iter(self):
        expected = b'GET /foo HTTP/1.1\r\nHost: example.com\r\n' \
                   b'Accept-Encoding: identity\r\nContent-Length: 11\r\n' \
                   b'\r\nonetwothree'

        def body():
            yield b"one"
            yield b"two"
            yield b"three"

        conn = client.HTTPConnection('example.com')
        sock = FakeSocket("")
        conn.sock = sock
        conn.request('GET', '/foo', body(), {'Content-Length': '11'})
        self.assertEqual(sock.data, expected)

    def test_blocksize_request(self):
        """Check that request() respects the configured block size."""
        blocksize = 8  # For easy debugging.
        conn = client.HTTPConnection('example.com', blocksize=blocksize)
        sock = FakeSocket(None)
        conn.sock = sock
        expected = b"a" * blocksize + b"b"
        conn.request("PUT", "/", io.BytesIO(expected), {"Content-Length": "9"})
        self.assertEqual(sock.sendall_calls, 3)
        body = sock.data.split(b"\r\n\r\n", 1)[1]
        self.assertEqual(body, expected)

    def test_blocksize_send(self):
        """Check that send() respects the configured block size."""
        blocksize = 8  # For easy debugging.
        conn = client.HTTPConnection('example.com', blocksize=blocksize)
        sock = FakeSocket(None)
        conn.sock = sock
        expected = b"a" * blocksize + b"b"
        conn.send(io.BytesIO(expected))
        self.assertEqual(sock.sendall_calls, 2)
        self.assertEqual(sock.data, expected)

    def test_send_type_error(self):
        # See: Issue #12676
        conn = client.HTTPConnection('example.com')
        conn.sock = FakeSocket('')
        with self.assertRaises(TypeError):
            conn.request('POST', 'test', conn)

    def test_chunked(self):
        expected = chunked_expected
        sock = FakeSocket(chunked_start + last_chunk + chunked_end)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.read(), expected)
        resp.close()

        # Various read sizes
        for n in range(1, 12):
            sock = FakeSocket(chunked_start + last_chunk + chunked_end)
            resp = client.HTTPResponse(sock, method="GET")
            resp.begin()
            self.assertEqual(resp.read(n) + resp.read(n) + resp.read(), expected)
            resp.close()

        for x in ('', 'foo\r\n'):
            sock = FakeSocket(chunked_start + x)
            resp = client.HTTPResponse(sock, method="GET")
            resp.begin()
            try:
                resp.read()
            except client.IncompleteRead as i:
                self.assertEqual(i.partial, expected)
                expected_message = 'IncompleteRead(%d bytes read)' % len(expected)
                self.assertEqual(repr(i), expected_message)
                self.assertEqual(str(i), expected_message)
            else:
                self.fail('IncompleteRead expected')
            finally:
                resp.close()

    def test_readinto_chunked(self):

        expected = chunked_expected
        nexpected = len(expected)
        b = bytearray(128)

        sock = FakeSocket(chunked_start + last_chunk + chunked_end)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        n = resp.readinto(b)
        self.assertEqual(b[:nexpected], expected)
        self.assertEqual(n, nexpected)
        resp.close()

        # Various read sizes
        for n in range(1, 12):
            sock = FakeSocket(chunked_start + last_chunk + chunked_end)
            resp = client.HTTPResponse(sock, method="GET")
            resp.begin()
            m = memoryview(b)
            i = resp.readinto(m[0:n])
            i += resp.readinto(m[i:n + i])
            i += resp.readinto(m[i:])
            self.assertEqual(b[:nexpected], expected)
            self.assertEqual(i, nexpected)
            resp.close()

        for x in ('', 'foo\r\n'):
            sock = FakeSocket(chunked_start + x)
            resp = client.HTTPResponse(sock, method="GET")
            resp.begin()
            try:
                n = resp.readinto(b)
            except client.IncompleteRead as i:
                self.assertEqual(i.partial, expected)
                expected_message = 'IncompleteRead(%d bytes read)' % len(expected)
                self.assertEqual(repr(i), expected_message)
                self.assertEqual(str(i), expected_message)
            else:
                self.fail('IncompleteRead expected')
            finally:
                resp.close()

    def test_chunked_head(self):
        chunked_start = (
            'HTTP/1.1 200 OK\r\n'
            'Transfer-Encoding: chunked\r\n\r\n'
            'a\r\n'
            'hello world\r\n'
            '1\r\n'
            'd\r\n'
        )
        sock = FakeSocket(chunked_start + last_chunk + chunked_end)
        resp = client.HTTPResponse(sock, method="HEAD")
        resp.begin()
        self.assertEqual(resp.read(), b'')
        self.assertEqual(resp.status, 200)
        self.assertEqual(resp.reason, 'OK')
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

    def test_readinto_chunked_head(self):
        chunked_start = (
            'HTTP/1.1 200 OK\r\n'
            'Transfer-Encoding: chunked\r\n\r\n'
            'a\r\n'
            'hello world\r\n'
            '1\r\n'
            'd\r\n'
        )
        sock = FakeSocket(chunked_start + last_chunk + chunked_end)
        resp = client.HTTPResponse(sock, method="HEAD")
        resp.begin()
        b = bytearray(5)
        n = resp.readinto(b)
        self.assertEqual(n, 0)
        self.assertEqual(bytes(b), b'\x00'*5)
        self.assertEqual(resp.status, 200)
        self.assertEqual(resp.reason, 'OK')
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

    def test_negative_content_length(self):
        sock = FakeSocket(
            'HTTP/1.1 200 OK\r\nContent-Length: -1\r\n\r\nHello\r\n')
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.read(), b'Hello\r\n')
        self.assertTrue(resp.isclosed())

    def test_incomplete_read(self):
        sock = FakeSocket('HTTP/1.1 200 OK\r\nContent-Length: 10\r\n\r\nHello\r\n')
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        try:
            resp.read()
        except client.IncompleteRead as i:
            self.assertEqual(i.partial, b'Hello\r\n')
            self.assertEqual(repr(i),
                             "IncompleteRead(7 bytes read, 3 more expected)")
            self.assertEqual(str(i),
                             "IncompleteRead(7 bytes read, 3 more expected)")
            self.assertTrue(resp.isclosed())
        else:
            self.fail('IncompleteRead expected')

    def test_epipe(self):
        sock = EPipeSocket(
            "HTTP/1.0 401 Authorization Required\r\n"
            "Content-type: text/html\r\n"
            "WWW-Authenticate: Basic realm=\"example\"\r\n",
            b"Content-Length")
        conn = client.HTTPConnection("example.com")
        conn.sock = sock
        self.assertRaises(OSError,
                          lambda: conn.request("PUT", "/url", "body"))
        resp = conn.getresponse()
        self.assertEqual(401, resp.status)
        self.assertEqual("Basic realm=\"example\"",
                         resp.getheader("www-authenticate"))

    # Test lines overflowing the max line size (_MAXLINE in http.client)

    def test_overflowing_status_line(self):
        body = "HTTP/1.1 200 Ok" + "k" * 65536 + "\r\n"
        resp = client.HTTPResponse(FakeSocket(body))
        self.assertRaises((client.LineTooLong, client.BadStatusLine), resp.begin)

    def test_overflowing_header_line(self):
        body = (
            'HTTP/1.1 200 OK\r\n'
            'X-Foo: bar' + 'r' * 65536 + '\r\n\r\n'
        )
        resp = client.HTTPResponse(FakeSocket(body))
        self.assertRaises(client.LineTooLong, resp.begin)

    def test_overflowing_header_limit_after_100(self):
        body = (
            'HTTP/1.1 100 OK\r\n'
            'r\n' * 32768
        )
        resp = client.HTTPResponse(FakeSocket(body))
        with self.assertRaises(client.HTTPException) as cm:
            resp.begin()
        # We must assert more because other reasonable errors that we
        # do not want can also be HTTPException derived.
        self.assertIn('got more than ', str(cm.exception))
        self.assertIn('headers', str(cm.exception))

    def test_overflowing_chunked_line(self):
        body = (
            'HTTP/1.1 200 OK\r\n'
            'Transfer-Encoding: chunked\r\n\r\n'
            + '0' * 65536 + 'a\r\n'
            'hello world\r\n'
            '0\r\n'
            '\r\n'
        )
        resp = client.HTTPResponse(FakeSocket(body))
        resp.begin()
        self.assertRaises(client.LineTooLong, resp.read)

    def test_early_eof(self):
        # Test httpresponse with no \r\n termination,
        body = "HTTP/1.1 200 Ok"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        self.assertEqual(resp.read(), b'')
        self.assertTrue(resp.isclosed())
        self.assertFalse(resp.closed)
        resp.close()
        self.assertTrue(resp.closed)

    def test_error_leak(self):
        # Test that the socket is not leaked if getresponse() fails
        conn = client.HTTPConnection('example.com')
        response = None
        class Response(client.HTTPResponse):
            def __init__(self, *pos, **kw):
                nonlocal response
                response = self  # Avoid garbage collector closing the socket
                client.HTTPResponse.__init__(self, *pos, **kw)
        conn.response_class = Response
        conn.sock = FakeSocket('Invalid status line')
        conn.request('GET', '/')
        self.assertRaises(client.BadStatusLine, conn.getresponse)
        self.assertTrue(response.closed)
        self.assertTrue(conn.sock.file_closed)

    def test_chunked_extension(self):
        extra = '3;foo=bar\r\n' + 'abc\r\n'
        expected = chunked_expected + b'abc'

        sock = FakeSocket(chunked_start + extra + last_chunk_extended + chunked_end)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.read(), expected)
        resp.close()

    def test_chunked_missing_end(self):
        """some servers may serve up a short chunked encoding stream"""
        expected = chunked_expected
        sock = FakeSocket(chunked_start + last_chunk)  #no terminating crlf
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.read(), expected)
        resp.close()

    def test_chunked_trailers(self):
        """See that trailers are read and ignored"""
        expected = chunked_expected
        sock = FakeSocket(chunked_start + last_chunk + trailers + chunked_end)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.read(), expected)
        # we should have reached the end of the file
        self.assertEqual(sock.file.read(), b"") #we read to the end
        resp.close()

    def test_chunked_sync(self):
        """Check that we don't read past the end of the chunked-encoding stream"""
        expected = chunked_expected
        extradata = "extradata"
        sock = FakeSocket(chunked_start + last_chunk + trailers + chunked_end + extradata)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.read(), expected)
        # the file should now have our extradata ready to be read
        self.assertEqual(sock.file.read(), extradata.encode("ascii")) #we read to the end
        resp.close()

    def test_content_length_sync(self):
        """Check that we don't read past the end of the Content-Length stream"""
        extradata = b"extradata"
        expected = b"Hello123\r\n"
        sock = FakeSocket(b'HTTP/1.1 200 OK\r\nContent-Length: 10\r\n\r\n' + expected + extradata)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.read(), expected)
        # the file should now have our extradata ready to be read
        self.assertEqual(sock.file.read(), extradata) #we read to the end
        resp.close()

    def test_readlines_content_length(self):
        extradata = b"extradata"
        expected = b"Hello123\r\n"
        sock = FakeSocket(b'HTTP/1.1 200 OK\r\nContent-Length: 10\r\n\r\n' + expected + extradata)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.readlines(2000), [expected])
        # the file should now have our extradata ready to be read
        self.assertEqual(sock.file.read(), extradata) #we read to the end
        resp.close()

    def test_read1_content_length(self):
        extradata = b"extradata"
        expected = b"Hello123\r\n"
        sock = FakeSocket(b'HTTP/1.1 200 OK\r\nContent-Length: 10\r\n\r\n' + expected + extradata)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.read1(2000), expected)
        # the file should now have our extradata ready to be read
        self.assertEqual(sock.file.read(), extradata) #we read to the end
        resp.close()

    def test_readline_bound_content_length(self):
        extradata = b"extradata"
        expected = b"Hello123\r\n"
        sock = FakeSocket(b'HTTP/1.1 200 OK\r\nContent-Length: 10\r\n\r\n' + expected + extradata)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.readline(10), expected)
        self.assertEqual(resp.readline(10), b"")
        # the file should now have our extradata ready to be read
        self.assertEqual(sock.file.read(), extradata) #we read to the end
        resp.close()

    def test_read1_bound_content_length(self):
        extradata = b"extradata"
        expected = b"Hello123\r\n"
        sock = FakeSocket(b'HTTP/1.1 200 OK\r\nContent-Length: 30\r\n\r\n' + expected*3 + extradata)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEqual(resp.read1(20), expected*2)
        self.assertEqual(resp.read(), expected)
        # the file should now have our extradata ready to be read
        self.assertEqual(sock.file.read(), extradata) #we read to the end
        resp.close()

    def test_response_fileno(self):
        # Make sure fd returned by fileno is valid.
        serv = socket.create_server((HOST, 0))
        self.addCleanup(serv.close)

        result = None
        def run_server():
            [conn, address] = serv.accept()
            with conn, conn.makefile("rb") as reader:
                # Read the request header until a blank line
                while True:
                    line = reader.readline()
                    if not line.rstrip(b"\r\n"):
                        break
                conn.sendall(b"HTTP/1.1 200 Connection established\r\n\r\n")
                nonlocal result
                result = reader.read()

        thread = threading.Thread(target=run_server)
        thread.start()
        self.addCleanup(thread.join, float(1))
        conn = client.HTTPConnection(*serv.getsockname())
        conn.request("CONNECT", "dummy:1234")
        response = conn.getresponse()
        try:
            self.assertEqual(response.status, client.OK)
            s = socket.socket(fileno=response.fileno())
            try:
                s.sendall(b"proxied data\n")
            finally:
                s.detach()
        finally:
            response.close()
            conn.close()
        thread.join()
        self.assertEqual(result, b"proxied data\n")

    def test_putrequest_override_domain_validation(self):
        """
        It should be possible to override the default validation
        behavior in putrequest (bpo-38216).
        """
        class UnsafeHTTPConnection(client.HTTPConnection):
            def _validate_path(self, url):
                pass

        conn = UnsafeHTTPConnection('example.com')
        conn.sock = FakeSocket('')
        conn.putrequest('GET', '/\x00')

    def test_putrequest_override_host_validation(self):
        class UnsafeHTTPConnection(client.HTTPConnection):
            def _validate_host(self, url):
                pass

        conn = UnsafeHTTPConnection('example.com\r\n')
        conn.sock = FakeSocket('')
        # set skip_host so a ValueError is not raised upon adding the
        # invalid URL as the value of the "Host:" header
        conn.putrequest('GET', '/', skip_host=1)

    def test_putrequest_override_encoding(self):
        """
        It should be possible to override the default encoding
        to transmit bytes in another encoding even if invalid
        (bpo-36274).
        """
        class UnsafeHTTPConnection(client.HTTPConnection):
            def _encode_request(self, str_url):
                return str_url.encode('utf-8')

        conn = UnsafeHTTPConnection('example.com')
        conn.sock = FakeSocket('')
        conn.putrequest('GET', '/☃')


class ExtendedReadTest(TestCase):
    """
    Test peek(), read1(), readline()
    """
    lines = (
        'HTTP/1.1 200 OK\r\n'
        '\r\n'
        'hello world!\n'
        'and now \n'
        'for something completely different\n'
        'foo'
        )
    lines_expected = lines[lines.find('hello'):].encode("ascii")
    lines_chunked = (
        'HTTP/1.1 200 OK\r\n'
        'Transfer-Encoding: chunked\r\n\r\n'
        'a\r\n'
        'hello worl\r\n'
        '3\r\n'
        'd!\n\r\n'
        '9\r\n'
        'and now \n\r\n'
        '23\r\n'
        'for something completely different\n\r\n'
        '3\r\n'
        'foo\r\n'
        '0\r\n' # terminating chunk
        '\r\n'  # end of trailers
    )

    def setUp(self):
        sock = FakeSocket(self.lines)
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        resp.fp = io.BufferedReader(resp.fp)
        self.resp = resp



    def test_peek(self):
        resp = self.resp
        # patch up the buffered peek so that it returns not too much stuff
        oldpeek = resp.fp.peek
        def mypeek(n=-1):
            p = oldpeek(n)
            if n >= 0:
                return p[:n]
            return p[:10]
        resp.fp.peek = mypeek

        all = []
        while True:
            # try a short peek
            p = resp.peek(3)
            if p:
                self.assertGreater(len(p), 0)
                # then unbounded peek
                p2 = resp.peek()
                self.assertGreaterEqual(len(p2), len(p))
                self.assertTrue(p2.startswith(p))
                next = resp.read(len(p2))
                self.assertEqual(next, p2)
            else:
                next = resp.read()
                self.assertFalse(next)
            all.append(next)
            if not next:
                break
        self.assertEqual(b"".join(all), self.lines_expected)

    def test_readline(self):
        resp = self.resp
        self._verify_readline(self.resp.readline, self.lines_expected)

    def _verify_readline(self, readline, expected):
        all = []
        while True:
            # short readlines
            line = readline(5)
            if line and line != b"foo":
                if len(line) < 5:
                    self.assertTrue(line.endswith(b"\n"))
            all.append(line)
            if not line:
                break
        self.assertEqual(b"".join(all), expected)

    def test_read1(self):
        resp = self.resp
        def r():
            res = resp.read1(4)
            self.assertLessEqual(len(res), 4)
            return res
        readliner = Readliner(r)
        self._verify_readline(readliner.readline, self.lines_expected)

    def test_read1_unbounded(self):
        resp = self.resp
        all = []
        while True:
            data = resp.read1()
            if not data:
                break
            all.append(data)
        self.assertEqual(b"".join(all), self.lines_expected)

    def test_read1_bounded(self):
        resp = self.resp
        all = []
        while True:
            data = resp.read1(10)
            if not data:
                break
            self.assertLessEqual(len(data), 10)
            all.append(data)
        self.assertEqual(b"".join(all), self.lines_expected)

    def test_read1_0(self):
        self.assertEqual(self.resp.read1(0), b"")

    def test_peek_0(self):
        p = self.resp.peek(0)
        self.assertLessEqual(0, len(p))


class ExtendedReadTestChunked(ExtendedReadTest):
    """
    Test peek(), read1(), readline() in chunked mode
    """
    lines = (
        'HTTP/1.1 200 OK\r\n'
        'Transfer-Encoding: chunked\r\n\r\n'
        'a\r\n'
        'hello worl\r\n'
        '3\r\n'
        'd!\n\r\n'
        '9\r\n'
        'and now \n\r\n'
        '23\r\n'
        'for something completely different\n\r\n'
        '3\r\n'
        'foo\r\n'
        '0\r\n' # terminating chunk
        '\r\n'  # end of trailers
    )


class Readliner:
    """
    a simple readline class that uses an arbitrary read function and buffering
    """
    def __init__(self, readfunc):
        self.readfunc = readfunc
        self.remainder = b""

    def readline(self, limit):
        data = []
        datalen = 0
        read = self.remainder
        try:
            while True:
                idx = read.find(b'\n')
                if idx != -1:
                    break
                if datalen + len(read) >= limit:
                    idx = limit - datalen - 1
                # read more data
                data.append(read)
                read = self.readfunc()
                if not read:
                    idx = 0 #eof condition
                    break
            idx += 1
            data.append(read[:idx])
            self.remainder = read[idx:]
            return b"".join(data)
        except:
            self.remainder = b"".join(data)
            raise


class OfflineTest(TestCase):
    def test_all(self):
        # Documented objects defined in the module should be in __all__
        expected = {"responses"}  # Allowlist documented dict() object
        # HTTPMessage, parse_headers(), and the HTTP status code constants are
        # intentionally omitted for simplicity
        denylist = {"HTTPMessage", "parse_headers"}
        for name in dir(client):
            if name.startswith("_") or name in denylist:
                continue
            module_object = getattr(client, name)
            if getattr(module_object, "__module__", None) == "http.client":
                expected.add(name)
        self.assertCountEqual(client.__all__, expected)

    def test_responses(self):
        self.assertEqual(client.responses[client.NOT_FOUND], "Not Found")

    def test_client_constants(self):
        # Make sure we don't break backward compatibility with 3.4
        expected = [
            'CONTINUE',
            'SWITCHING_PROTOCOLS',
            'PROCESSING',
            'OK',
            'CREATED',
            'ACCEPTED',
            'NON_AUTHORITATIVE_INFORMATION',
            'NO_CONTENT',
            'RESET_CONTENT',
            'PARTIAL_CONTENT',
            'MULTI_STATUS',
            'IM_USED',
            'MULTIPLE_CHOICES',
            'MOVED_PERMANENTLY',
            'FOUND',
            'SEE_OTHER',
            'NOT_MODIFIED',
            'USE_PROXY',
            'TEMPORARY_REDIRECT',
            'BAD_REQUEST',
            'UNAUTHORIZED',
            'PAYMENT_REQUIRED',
            'FORBIDDEN',
            'NOT_FOUND',
            'METHOD_NOT_ALLOWED',
            'NOT_ACCEPTABLE',
            'PROXY_AUTHENTICATION_REQUIRED',
            'REQUEST_TIMEOUT',
            'CONFLICT',
            'GONE',
            'LENGTH_REQUIRED',
            'PRECONDITION_FAILED',
            'REQUEST_ENTITY_TOO_LARGE',
            'REQUEST_URI_TOO_LONG',
            'UNSUPPORTED_MEDIA_TYPE',
            'REQUESTED_RANGE_NOT_SATISFIABLE',
            'EXPECTATION_FAILED',
            'IM_A_TEAPOT',
            'MISDIRECTED_REQUEST',
            'UNPROCESSABLE_ENTITY',
            'LOCKED',
            'FAILED_DEPENDENCY',
            'UPGRADE_REQUIRED',
            'PRECONDITION_REQUIRED',
            'TOO_MANY_REQUESTS',
            'REQUEST_HEADER_FIELDS_TOO_LARGE',
            'UNAVAILABLE_FOR_LEGAL_REASONS',
            'INTERNAL_SERVER_ERROR',
            'NOT_IMPLEMENTED',
            'BAD_GATEWAY',
            'SERVICE_UNAVAILABLE',
            'GATEWAY_TIMEOUT',
            'HTTP_VERSION_NOT_SUPPORTED',
            'INSUFFICIENT_STORAGE',
            'NOT_EXTENDED',
            'NETWORK_AUTHENTICATION_REQUIRED',
            'EARLY_HINTS',
            'TOO_EARLY'
        ]
        for const in expected:
            with self.subTest(constant=const):
                self.assertTrue(hasattr(client, const))


class SourceAddressTest(TestCase):
    def setUp(self):
        self.serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.port = socket_helper.bind_port(self.serv)
        self.source_port = socket_helper.find_unused_port()
        self.serv.listen()
        self.conn = None

    def tearDown(self):
        if self.conn:
            self.conn.close()
            self.conn = None
        self.serv.close()
        self.serv = None

    def testHTTPConnectionSourceAddress(self):
        self.conn = client.HTTPConnection(HOST, self.port,
                source_address=('', self.source_port))
        self.conn.connect()
        self.assertEqual(self.conn.sock.getsockname()[1], self.source_port)

    @unittest.skipIf(not hasattr(client, 'HTTPSConnection'),
                     'http.client.HTTPSConnection not defined')
    def testHTTPSConnectionSourceAddress(self):
        self.conn = client.HTTPSConnection(HOST, self.port,
                source_address=('', self.source_port))
        # We don't test anything here other than the constructor not barfing as
        # this code doesn't deal with setting up an active running SSL server
        # for an ssl_wrapped connect() to actually return from.


class TimeoutTest(TestCase):
    PORT = None

    def setUp(self):
        self.serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        TimeoutTest.PORT = socket_helper.bind_port(self.serv)
        self.serv.listen()

    def tearDown(self):
        self.serv.close()
        self.serv = None

    def testTimeoutAttribute(self):
        # This will prove that the timeout gets through HTTPConnection
        # and into the socket.

        # default -- use global socket timeout
        self.assertIsNone(socket.getdefaulttimeout())
        socket.setdefaulttimeout(30)
        try:
            httpConn = client.HTTPConnection(HOST, TimeoutTest.PORT)
            httpConn.connect()
        finally:
            socket.setdefaulttimeout(None)
        self.assertEqual(httpConn.sock.gettimeout(), 30)
        httpConn.close()

        # no timeout -- do not use global socket default
        self.assertIsNone(socket.getdefaulttimeout())
        socket.setdefaulttimeout(30)
        try:
            httpConn = client.HTTPConnection(HOST, TimeoutTest.PORT,
                                              timeout=None)
            httpConn.connect()
        finally:
            socket.setdefaulttimeout(None)
        self.assertEqual(httpConn.sock.gettimeout(), None)
        httpConn.close()

        # a value
        httpConn = client.HTTPConnection(HOST, TimeoutTest.PORT, timeout=30)
        httpConn.connect()
        self.assertEqual(httpConn.sock.gettimeout(), 30)
        httpConn.close()


class PersistenceTest(TestCase):

    def test_reuse_reconnect(self):
        # Should reuse or reconnect depending on header from server
        tests = (
            ('1.0', '', False),
            ('1.0', 'Connection: keep-alive\r\n', True),
            ('1.1', '', True),
            ('1.1', 'Connection: close\r\n', False),
            ('1.0', 'Connection: keep-ALIVE\r\n', True),
            ('1.1', 'Connection: cloSE\r\n', False),
        )
        for version, header, reuse in tests:
            with self.subTest(version=version, header=header):
                msg = (
                    'HTTP/{} 200 OK\r\n'
                    '{}'
                    'Content-Length: 12\r\n'
                    '\r\n'
                    'Dummy body\r\n'
                ).format(version, header)
                conn = FakeSocketHTTPConnection(msg)
                self.assertIsNone(conn.sock)
                conn.request('GET', '/open-connection')
                with conn.getresponse() as response:
                    self.assertEqual(conn.sock is None, not reuse)
                    response.read()
                self.assertEqual(conn.sock is None, not reuse)
                self.assertEqual(conn.connections, 1)
                conn.request('GET', '/subsequent-request')
                self.assertEqual(conn.connections, 1 if reuse else 2)

    def test_disconnected(self):

        def make_reset_reader(text):
            """Return BufferedReader that raises ECONNRESET at EOF"""
            stream = io.BytesIO(text)
            def readinto(buffer):
                size = io.BytesIO.readinto(stream, buffer)
                if size == 0:
                    raise ConnectionResetError()
                return size
            stream.readinto = readinto
            return io.BufferedReader(stream)

        tests = (
            (io.BytesIO, client.RemoteDisconnected),
            (make_reset_reader, ConnectionResetError),
        )
        for stream_factory, exception in tests:
            with self.subTest(exception=exception):
                conn = FakeSocketHTTPConnection(b'', stream_factory)
                conn.request('GET', '/eof-response')
                self.assertRaises(exception, conn.getresponse)
                self.assertIsNone(conn.sock)
                # HTTPConnection.connect() should be automatically invoked
                conn.request('GET', '/reconnect')
                self.assertEqual(conn.connections, 2)

    def test_100_close(self):
        conn = FakeSocketHTTPConnection(
            b'HTTP/1.1 100 Continue\r\n'
            b'\r\n'
            # Missing final response
        )
        conn.request('GET', '/', headers={'Expect': '100-continue'})
        self.assertRaises(client.RemoteDisconnected, conn.getresponse)
        self.assertIsNone(conn.sock)
        conn.request('GET', '/reconnect')
        self.assertEqual(conn.connections, 2)


class HTTPSTest(TestCase):

    def setUp(self):
        if not hasattr(client, 'HTTPSConnection'):
            self.skipTest('ssl support required')

    def make_server(self, certfile):
        from test.ssl_servers import make_https_server
        return make_https_server(self, certfile=certfile)

    def test_attributes(self):
        # simple test to check it's storing the timeout
        h = client.HTTPSConnection(HOST, TimeoutTest.PORT, timeout=30)
        self.assertEqual(h.timeout, 30)

    def test_networked(self):
        # Default settings: requires a valid cert from a trusted CA
        import ssl
        support.requires('network')
        with socket_helper.transient_internet('self-signed.pythontest.net'):
            h = client.HTTPSConnection('self-signed.pythontest.net', 443)
            with self.assertRaises(ssl.SSLError) as exc_info:
                h.request('GET', '/')
            self.assertEqual(exc_info.exception.reason, 'CERTIFICATE_VERIFY_FAILED')

    def test_networked_noverification(self):
        # Switch off cert verification
        import ssl
        support.requires('network')
        with socket_helper.transient_internet('self-signed.pythontest.net'):
            context = ssl._create_unverified_context()
            h = client.HTTPSConnection('self-signed.pythontest.net', 443,
                                       context=context)
            h.request('GET', '/')
            resp = h.getresponse()
            h.close()
            self.assertIn('nginx', resp.getheader('server'))
            resp.close()

    @support.system_must_validate_cert
    def test_networked_trusted_by_default_cert(self):
        # Default settings: requires a valid cert from a trusted CA
        support.requires('network')
        with socket_helper.transient_internet('www.python.org'):
            h = client.HTTPSConnection('www.python.org', 443)
            h.request('GET', '/')
            resp = h.getresponse()
            content_type = resp.getheader('content-type')
            resp.close()
            h.close()
            self.assertIn('text/html', content_type)

    def test_networked_good_cert(self):
        # We feed the server's cert as a validating cert
        import ssl
        support.requires('network')
        selfsigned_pythontestdotnet = 'self-signed.pythontest.net'
        with socket_helper.transient_internet(selfsigned_pythontestdotnet):
            context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
            self.assertEqual(context.verify_mode, ssl.CERT_REQUIRED)
            self.assertEqual(context.check_hostname, True)
            context.load_verify_locations(CERT_selfsigned_pythontestdotnet)
            try:
                h = client.HTTPSConnection(selfsigned_pythontestdotnet, 443,
                                           context=context)
                h.request('GET', '/')
                resp = h.getresponse()
            except ssl.SSLError as ssl_err:
                ssl_err_str = str(ssl_err)
                # In the error message of [SSL: CERTIFICATE_VERIFY_FAILED] on
                # modern Linux distros (Debian Buster, etc) default OpenSSL
                # configurations it'll fail saying "key too weak" until we
                # address https://bugs.python.org/issue36816 to use a proper
                # key size on self-signed.pythontest.net.
                if re.search(r'(?i)key.too.weak', ssl_err_str):
                    raise unittest.SkipTest(
                        f'Got {ssl_err_str} trying to connect '
                        f'to {selfsigned_pythontestdotnet}. '
                        'See https://bugs.python.org/issue36816.')
                raise
            server_string = resp.getheader('server')
            resp.close()
            h.close()
            self.assertIn('nginx', server_string)

    @support.requires_resource('walltime')
    def test_networked_bad_cert(self):
        # We feed a "CA" cert that is unrelated to the server's cert
        import ssl
        support.requires('network')
        with socket_helper.transient_internet('self-signed.pythontest.net'):
            context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
            context.load_verify_locations(CERT_localhost)
            h = client.HTTPSConnection('self-signed.pythontest.net', 443, context=context)
            with self.assertRaises(ssl.SSLError) as exc_info:
                h.request('GET', '/')
            self.assertEqual(exc_info.exception.reason, 'CERTIFICATE_VERIFY_FAILED')

    def test_local_unknown_cert(self):
        # The custom cert isn't known to the default trust bundle
        import ssl
        server = self.make_server(CERT_localhost)
        h = client.HTTPSConnection('localhost', server.port)
        with self.assertRaises(ssl.SSLError) as exc_info:
            h.request('GET', '/')
        self.assertEqual(exc_info.exception.reason, 'CERTIFICATE_VERIFY_FAILED')

    def test_local_good_hostname(self):
        # The (valid) cert validates the HTTP hostname
        import ssl
        server = self.make_server(CERT_localhost)
        context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
        context.load_verify_locations(CERT_localhost)
        h = client.HTTPSConnection('localhost', server.port, context=context)
        self.addCleanup(h.close)
        h.request('GET', '/nonexistent')
        resp = h.getresponse()
        self.addCleanup(resp.close)
        self.assertEqual(resp.status, 404)

    def test_local_bad_hostname(self):
        # The (valid) cert doesn't validate the HTTP hostname
        import ssl
        server = self.make_server(CERT_fakehostname)
        context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
        context.load_verify_locations(CERT_fakehostname)
        h = client.HTTPSConnection('localhost', server.port, context=context)
        with self.assertRaises(ssl.CertificateError):
            h.request('GET', '/')
        # Same with explicit check_hostname=True
        with warnings_helper.check_warnings(('', DeprecationWarning)):
            h = client.HTTPSConnection('localhost', server.port,
                                       context=context, check_hostname=True)
        with self.assertRaises(ssl.CertificateError):
            h.request('GET', '/')
        # With check_hostname=False, the mismatching is ignored
        context.check_hostname = False
        with warnings_helper.check_warnings(('', DeprecationWarning)):
            h = client.HTTPSConnection('localhost', server.port,
                                       context=context, check_hostname=False)
        h.request('GET', '/nonexistent')
        resp = h.getresponse()
        resp.close()
        h.close()
        self.assertEqual(resp.status, 404)
        # The context's check_hostname setting is used if one isn't passed to
        # HTTPSConnection.
        context.check_hostname = False
        h = client.HTTPSConnection('localhost', server.port, context=context)
        h.request('GET', '/nonexistent')
        resp = h.getresponse()
        self.assertEqual(resp.status, 404)
        resp.close()
        h.close()
        # Passing check_hostname to HTTPSConnection should override the
        # context's setting.
        with warnings_helper.check_warnings(('', DeprecationWarning)):
            h = client.HTTPSConnection('localhost', server.port,
                                       context=context, check_hostname=True)
        with self.assertRaises(ssl.CertificateError):
            h.request('GET', '/')

    @unittest.skipIf(not hasattr(client, 'HTTPSConnection'),
                     'http.client.HTTPSConnection not available')
    def test_host_port(self):
        # Check invalid host_port

        for hp in ("www.python.org:abc", "user:password@www.python.org"):
            self.assertRaises(client.InvalidURL, client.HTTPSConnection, hp)

        for hp, h, p in (("[fe80::207:e9ff:fe9b]:8000",
                          "fe80::207:e9ff:fe9b", 8000),
                         ("www.python.org:443", "www.python.org", 443),
                         ("www.python.org:", "www.python.org", 443),
                         ("www.python.org", "www.python.org", 443),
                         ("[fe80::207:e9ff:fe9b]", "fe80::207:e9ff:fe9b", 443),
                         ("[fe80::207:e9ff:fe9b]:", "fe80::207:e9ff:fe9b",
                             443)):
            c = client.HTTPSConnection(hp)
            self.assertEqual(h, c.host)
            self.assertEqual(p, c.port)

    def test_tls13_pha(self):
        import ssl
        if not ssl.HAS_TLSv1_3:
            self.skipTest('TLS 1.3 support required')
        # just check status of PHA flag
        h = client.HTTPSConnection('localhost', 443)
        self.assertTrue(h._context.post_handshake_auth)

        context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
        self.assertFalse(context.post_handshake_auth)
        h = client.HTTPSConnection('localhost', 443, context=context)
        self.assertIs(h._context, context)
        self.assertFalse(h._context.post_handshake_auth)

        with warnings.catch_warnings():
            warnings.filterwarnings('ignore', 'key_file, cert_file and check_hostname are deprecated',
                                    DeprecationWarning)
            h = client.HTTPSConnection('localhost', 443, context=context,
                                       cert_file=CERT_localhost)
        self.assertTrue(h._context.post_handshake_auth)


class RequestBodyTest(TestCase):
    """Test cases where a request includes a message body."""

    def setUp(self):
        self.conn = client.HTTPConnection('example.com')
        self.conn.sock = self.sock = FakeSocket("")
        self.conn.sock = self.sock

    def get_headers_and_fp(self):
        f = io.BytesIO(self.sock.data)
        f.readline()  # read the request line
        message = client.parse_headers(f)
        return message, f

    def test_list_body(self):
        # Note that no content-length is automatically calculated for
        # an iterable.  The request will fall back to send chunked
        # transfer encoding.
        cases = (
            ([b'foo', b'bar'], b'3\r\nfoo\r\n3\r\nbar\r\n0\r\n\r\n'),
            ((b'foo', b'bar'), b'3\r\nfoo\r\n3\r\nbar\r\n0\r\n\r\n'),
        )
        for body, expected in cases:
            with self.subTest(body):
                self.conn = client.HTTPConnection('example.com')
                self.conn.sock = self.sock = FakeSocket('')

                self.conn.request('PUT', '/url', body)
                msg, f = self.get_headers_and_fp()
                self.assertNotIn('Content-Type', msg)
                self.assertNotIn('Content-Length', msg)
                self.assertEqual(msg.get('Transfer-Encoding'), 'chunked')
                self.assertEqual(expected, f.read())

    def test_manual_content_length(self):
        # Set an incorrect content-length so that we can verify that
        # it will not be over-ridden by the library.
        self.conn.request("PUT", "/url", "body",
                          {"Content-Length": "42"})
        message, f = self.get_headers_and_fp()
        self.assertEqual("42", message.get("content-length"))
        self.assertEqual(4, len(f.read()))

    def test_ascii_body(self):
        self.conn.request("PUT", "/url", "body")
        message, f = self.get_headers_and_fp()
        self.assertEqual("text/plain", message.get_content_type())
        self.assertIsNone(message.get_charset())
        self.assertEqual("4", message.get("content-length"))
        self.assertEqual(b'body', f.read())

    def test_latin1_body(self):
        self.conn.request("PUT", "/url", "body\xc1")
        message, f = self.get_headers_and_fp()
        self.assertEqual("text/plain", message.get_content_type())
        self.assertIsNone(message.get_charset())
        self.assertEqual("5", message.get("content-length"))
        self.assertEqual(b'body\xc1', f.read())

    def test_bytes_body(self):
        self.conn.request("PUT", "/url", b"body\xc1")
        message, f = self.get_headers_and_fp()
        self.assertEqual("text/plain", message.get_content_type())
        self.assertIsNone(message.get_charset())
        self.assertEqual("5", message.get("content-length"))
        self.assertEqual(b'body\xc1', f.read())

    def test_text_file_body(self):
        self.addCleanup(os_helper.unlink, os_helper.TESTFN)
        with open(os_helper.TESTFN, "w", encoding="utf-8") as f:
            f.write("body")
        with open(os_helper.TESTFN, encoding="utf-8") as f:
            self.conn.request("PUT", "/url", f)
            message, f = self.get_headers_and_fp()
            self.assertEqual("text/plain", message.get_content_type())
            self.assertIsNone(message.get_charset())
            # No content-length will be determined for files; the body
            # will be sent using chunked transfer encoding instead.
            self.assertIsNone(message.get("content-length"))
            self.assertEqual("chunked", message.get("transfer-encoding"))
            self.assertEqual(b'4\r\nbody\r\n0\r\n\r\n', f.read())

    def test_binary_file_body(self):
        self.addCleanup(os_helper.unlink, os_helper.TESTFN)
        with open(os_helper.TESTFN, "wb") as f:
            f.write(b"body\xc1")
        with open(os_helper.TESTFN, "rb") as f:
            self.conn.request("PUT", "/url", f)
            message, f = self.get_headers_and_fp()
            self.assertEqual("text/plain", message.get_content_type())
            self.assertIsNone(message.get_charset())
            self.assertEqual("chunked", message.get("Transfer-Encoding"))
            self.assertNotIn("Content-Length", message)
            self.assertEqual(b'5\r\nbody\xc1\r\n0\r\n\r\n', f.read())


class HTTPResponseTest(TestCase):

    def setUp(self):
        body = "HTTP/1.1 200 Ok\r\nMy-Header: first-value\r\nMy-Header: \
                second-value\r\n\r\nText"
        sock = FakeSocket(body)
        self.resp = client.HTTPResponse(sock)
        self.resp.begin()

    def test_getting_header(self):
        header = self.resp.getheader('My-Header')
        self.assertEqual(header, 'first-value, second-value')

        header = self.resp.getheader('My-Header', 'some default')
        self.assertEqual(header, 'first-value, second-value')

    def test_getting_nonexistent_header_with_string_default(self):
        header = self.resp.getheader('No-Such-Header', 'default-value')
        self.assertEqual(header, 'default-value')

    def test_getting_nonexistent_header_with_iterable_default(self):
        header = self.resp.getheader('No-Such-Header', ['default', 'values'])
        self.assertEqual(header, 'default, values')

        header = self.resp.getheader('No-Such-Header', ('default', 'values'))
        self.assertEqual(header, 'default, values')

    def test_getting_nonexistent_header_without_default(self):
        header = self.resp.getheader('No-Such-Header')
        self.assertEqual(header, None)

    def test_getting_header_defaultint(self):
        header = self.resp.getheader('No-Such-Header',default=42)
        self.assertEqual(header, 42)

class TunnelTests(TestCase):
    def setUp(self):
        response_text = (
            'HTTP/1.0 200 OK\r\n\r\n' # Reply to CONNECT
            'HTTP/1.1 200 OK\r\n' # Reply to HEAD
            'Content-Length: 42\r\n\r\n'
        )
        self.host = 'proxy.com'
        self.conn = client.HTTPConnection(self.host)
        self.conn._create_connection = self._create_connection(response_text)

    def tearDown(self):
        self.conn.close()

    def _create_connection(self, response_text):
        def create_connection(address, timeout=None, source_address=None):
            return FakeSocket(response_text, host=address[0], port=address[1])
        return create_connection

    def test_set_tunnel_host_port_headers(self):
        tunnel_host = 'destination.com'
        tunnel_port = 8888
        tunnel_headers = {'User-Agent': 'Mozilla/5.0 (compatible, MSIE 11)'}
        self.conn.set_tunnel(tunnel_host, port=tunnel_port,
                             headers=tunnel_headers)
        self.conn.request('HEAD', '/', '')
        self.assertEqual(self.conn.sock.host, self.host)
        self.assertEqual(self.conn.sock.port, client.HTTP_PORT)
        self.assertEqual(self.conn._tunnel_host, tunnel_host)
        self.assertEqual(self.conn._tunnel_port, tunnel_port)
        self.assertEqual(self.conn._tunnel_headers, tunnel_headers)

    def test_disallow_set_tunnel_after_connect(self):
        # Once connected, we shouldn't be able to tunnel anymore
        self.conn.connect()
        self.assertRaises(RuntimeError, self.conn.set_tunnel,
                          'destination.com')

    def test_connect_with_tunnel(self):
        self.conn.set_tunnel('destination.com')
        self.conn.request('HEAD', '/', '')
        self.assertEqual(self.conn.sock.host, self.host)
        self.assertEqual(self.conn.sock.port, client.HTTP_PORT)
        self.assertIn(b'CONNECT destination.com', self.conn.sock.data)
        # issue22095
        self.assertNotIn(b'Host: destination.com:None', self.conn.sock.data)
        self.assertIn(b'Host: destination.com', self.conn.sock.data)

        # This test should be removed when CONNECT gets the HTTP/1.1 blessing
        self.assertNotIn(b'Host: proxy.com', self.conn.sock.data)

    def test_tunnel_connect_single_send_connection_setup(self):
        """Regresstion test for https://bugs.python.org/issue43332."""
        with mock.patch.object(self.conn, 'send') as mock_send:
            self.conn.set_tunnel('destination.com')
            self.conn.connect()
            self.conn.request('GET', '/')
        mock_send.assert_called()
        # Likely 2, but this test only cares about the first.
        self.assertGreater(
                len(mock_send.mock_calls), 1,
                msg=f'unexpected number of send calls: {mock_send.mock_calls}')
        proxy_setup_data_sent = mock_send.mock_calls[0][1][0]
        self.assertIn(b'CONNECT destination.com', proxy_setup_data_sent)
        self.assertTrue(
                proxy_setup_data_sent.endswith(b'\r\n\r\n'),
                msg=f'unexpected proxy data sent {proxy_setup_data_sent!r}')

    def test_connect_put_request(self):
        self.conn.set_tunnel('destination.com')
        self.conn.request('PUT', '/', '')
        self.assertEqual(self.conn.sock.host, self.host)
        self.assertEqual(self.conn.sock.port, client.HTTP_PORT)
        self.assertIn(b'CONNECT destination.com', self.conn.sock.data)
        self.assertIn(b'Host: destination.com', self.conn.sock.data)

    def test_tunnel_debuglog(self):
        expected_header = 'X-Dummy: 1'
        response_text = 'HTTP/1.0 200 OK\r\n{}\r\n\r\n'.format(expected_header)

        self.conn.set_debuglevel(1)
        self.conn._create_connection = self._create_connection(response_text)
        self.conn.set_tunnel('destination.com')

        with support.captured_stdout() as output:
            self.conn.request('PUT', '/', '')
        lines = output.getvalue().splitlines()
        self.assertIn('header: {}'.format(expected_header), lines)

    def test_tunnel_leak(self):
        sock = None

        def _create_connection(address, timeout=None, source_address=None):
            nonlocal sock
            sock = FakeSocket(
                'HTTP/1.1 404 NOT FOUND\r\n\r\n',
                host=address[0],
                port=address[1],
            )
            return sock

        self.conn._create_connection = _create_connection
        self.conn.set_tunnel('destination.com')
        exc = None
        try:
            self.conn.request('HEAD', '/', '')
        except OSError as e:
            # keeping a reference to exc keeps response alive in the traceback
            exc = e
        self.assertIsNotNone(exc)
        self.assertTrue(sock.file_closed)


if __name__ == '__main__':
    unittest.main(verbosity=2)
