"""Tests for TCP connection handling, including proper and timely close."""

import socket
import sys
import time
import errno


import cherrypy
from cherrypy._cpcompat import HTTPConnection, HTTPSConnection, NotConnected
from cherrypy._cpcompat import (
    BadStatusLine,
    ntob,
    tonative,
    urlopen,
    unicodestr,
    py3k
)
from cherrypy.test import webtest


timeout = 1
pov = 'pPeErRsSiIsStTeEnNcCeE oOfF vViIsSiIoOnN'


def setup_server():

    def raise500():
        raise cherrypy.HTTPError(500)

    class Root:

        def index(self):
            return pov
        index.exposed = True
        page1 = index
        page2 = index
        page3 = index

        def hello(self):
            return "Hello, world!"
        hello.exposed = True

        def timeout(self, t):
            return str(cherrypy.server.httpserver.timeout)
        timeout.exposed = True

        def stream(self, set_cl=False):
            if set_cl:
                cherrypy.response.headers['Content-Length'] = 10

            def content():
                for x in range(10):
                    yield str(x)

            return content()
        stream.exposed = True
        stream._cp_config = {'response.stream': True}

        def error(self, code=500):
            raise cherrypy.HTTPError(code)
        error.exposed = True

        def upload(self):
            if not cherrypy.request.method == 'POST':
                raise AssertionError("'POST' != request.method %r" %
                                     cherrypy.request.method)
            return "thanks for '%s'" % cherrypy.request.body.read()
        upload.exposed = True

        def custom(self, response_code):
            cherrypy.response.status = response_code
            return "Code = %s" % response_code
        custom.exposed = True

        def err_before_read(self):
            return "ok"
        err_before_read.exposed = True
        err_before_read._cp_config = {'hooks.on_start_resource': raise500}

        def one_megabyte_of_a(self):
            return ["a" * 1024] * 1024
        one_megabyte_of_a.exposed = True

        def custom_cl(self, body, cl):
            cherrypy.response.headers['Content-Length'] = cl
            if not isinstance(body, list):
                body = [body]
            newbody = []
            for chunk in body:
                if isinstance(chunk, unicodestr):
                    chunk = chunk.encode('ISO-8859-1')
                newbody.append(chunk)
            return newbody
        custom_cl.exposed = True
        # Turn off the encoding tool so it doens't collapse
        # our response body and reclaculate the Content-Length.
        custom_cl._cp_config = {'tools.encode.on': False}

    cherrypy.tree.mount(Root())
    cherrypy.config.update({
        'server.max_request_body_size': 1001,
        'server.socket_timeout': timeout,
    })


from cherrypy.test import helper


class ConnectionCloseTests(helper.CPWebCase):
    setup_server = staticmethod(setup_server)

    def test_HTTP11(self):
        if cherrypy.server.protocol_version != "HTTP/1.1":
            return self.skip()

        self.PROTOCOL = "HTTP/1.1"

        self.persistent = True

        # Make the first request and assert there's no "Connection: close".
        self.getPage("/")
        self.assertStatus('200 OK')
        self.assertBody(pov)
        self.assertNoHeader("Connection")

        # Make another request on the same connection.
        self.getPage("/page1")
        self.assertStatus('200 OK')
        self.assertBody(pov)
        self.assertNoHeader("Connection")

        # Test client-side close.
        self.getPage("/page2", headers=[("Connection", "close")])
        self.assertStatus('200 OK')
        self.assertBody(pov)
        self.assertHeader("Connection", "close")

        # Make another request on the same connection, which should error.
        self.assertRaises(NotConnected, self.getPage, "/")

    def test_Streaming_no_len(self):
        try:
            self._streaming(set_cl=False)
        finally:
            try:
                self.HTTP_CONN.close()
            except (TypeError, AttributeError):
                pass

    def test_Streaming_with_len(self):
        try:
            self._streaming(set_cl=True)
        finally:
            try:
                self.HTTP_CONN.close()
            except (TypeError, AttributeError):
                pass

    def _streaming(self, set_cl):
        if cherrypy.server.protocol_version == "HTTP/1.1":
            self.PROTOCOL = "HTTP/1.1"

            self.persistent = True

            # Make the first request and assert there's no "Connection: close".
            self.getPage("/")
            self.assertStatus('200 OK')
            self.assertBody(pov)
            self.assertNoHeader("Connection")

            # Make another, streamed request on the same connection.
            if set_cl:
                # When a Content-Length is provided, the content should stream
                # without closing the connection.
                self.getPage("/stream?set_cl=Yes")
                self.assertHeader("Content-Length")
                self.assertNoHeader("Connection", "close")
                self.assertNoHeader("Transfer-Encoding")

                self.assertStatus('200 OK')
                self.assertBody('0123456789')
            else:
                # When no Content-Length response header is provided,
                # streamed output will either close the connection, or use
                # chunked encoding, to determine transfer-length.
                self.getPage("/stream")
                self.assertNoHeader("Content-Length")
                self.assertStatus('200 OK')
                self.assertBody('0123456789')

                chunked_response = False
                for k, v in self.headers:
                    if k.lower() == "transfer-encoding":
                        if str(v) == "chunked":
                            chunked_response = True

                if chunked_response:
                    self.assertNoHeader("Connection", "close")
                else:
                    self.assertHeader("Connection", "close")

                    # Make another request on the same connection, which should
                    # error.
                    self.assertRaises(NotConnected, self.getPage, "/")

                # Try HEAD. See
                # https://github.com/cherrypy/cherrypy/issues/864.
                self.getPage("/stream", method='HEAD')
                self.assertStatus('200 OK')
                self.assertBody('')
                self.assertNoHeader("Transfer-Encoding")
        else:
            self.PROTOCOL = "HTTP/1.0"

            self.persistent = True

            # Make the first request and assert Keep-Alive.
            self.getPage("/", headers=[("Connection", "Keep-Alive")])
            self.assertStatus('200 OK')
            self.assertBody(pov)
            self.assertHeader("Connection", "Keep-Alive")

            # Make another, streamed request on the same connection.
            if set_cl:
                # When a Content-Length is provided, the content should
                # stream without closing the connection.
                self.getPage("/stream?set_cl=Yes",
                             headers=[("Connection", "Keep-Alive")])
                self.assertHeader("Content-Length")
                self.assertHeader("Connection", "Keep-Alive")
                self.assertNoHeader("Transfer-Encoding")
                self.assertStatus('200 OK')
                self.assertBody('0123456789')
            else:
                # When a Content-Length is not provided,
                # the server should close the connection.
                self.getPage("/stream", headers=[("Connection", "Keep-Alive")])
                self.assertStatus('200 OK')
                self.assertBody('0123456789')

                self.assertNoHeader("Content-Length")
                self.assertNoHeader("Connection", "Keep-Alive")
                self.assertNoHeader("Transfer-Encoding")

                # Make another request on the same connection, which should
                # error.
                self.assertRaises(NotConnected, self.getPage, "/")

    def test_HTTP10_KeepAlive(self):
        self.PROTOCOL = "HTTP/1.0"
        if self.scheme == "https":
            self.HTTP_CONN = HTTPSConnection
        else:
            self.HTTP_CONN = HTTPConnection

        # Test a normal HTTP/1.0 request.
        self.getPage("/page2")
        self.assertStatus('200 OK')
        self.assertBody(pov)
        # Apache, for example, may emit a Connection header even for HTTP/1.0
# self.assertNoHeader("Connection")

        # Test a keep-alive HTTP/1.0 request.
        self.persistent = True

        self.getPage("/page3", headers=[("Connection", "Keep-Alive")])
        self.assertStatus('200 OK')
        self.assertBody(pov)
        self.assertHeader("Connection", "Keep-Alive")

        # Remove the keep-alive header again.
        self.getPage("/page3")
        self.assertStatus('200 OK')
        self.assertBody(pov)
        # Apache, for example, may emit a Connection header even for HTTP/1.0
# self.assertNoHeader("Connection")


class PipelineTests(helper.CPWebCase):
    setup_server = staticmethod(setup_server)

    def test_HTTP11_Timeout(self):
        # If we timeout without sending any data,
        # the server will close the conn with a 408.
        if cherrypy.server.protocol_version != "HTTP/1.1":
            return self.skip()

        self.PROTOCOL = "HTTP/1.1"

        # Connect but send nothing.
        self.persistent = True
        conn = self.HTTP_CONN
        conn.auto_open = False
        conn.connect()

        # Wait for our socket timeout
        time.sleep(timeout * 2)

        # The request should have returned 408 already.
        response = conn.response_class(conn.sock, method="GET")
        response.begin()
        self.assertEqual(response.status, 408)
        conn.close()

        # Connect but send half the headers only.
        self.persistent = True
        conn = self.HTTP_CONN
        conn.auto_open = False
        conn.connect()
        conn.send(ntob('GET /hello HTTP/1.1'))
        conn.send(("Host: %s" % self.HOST).encode('ascii'))

        # Wait for our socket timeout
        time.sleep(timeout * 2)

        # The conn should have already sent 408.
        response = conn.response_class(conn.sock, method="GET")
        response.begin()
        self.assertEqual(response.status, 408)
        conn.close()

    def test_HTTP11_Timeout_after_request(self):
        # If we timeout after at least one request has succeeded,
        # the server will close the conn without 408.
        if cherrypy.server.protocol_version != "HTTP/1.1":
            return self.skip()

        self.PROTOCOL = "HTTP/1.1"

        # Make an initial request
        self.persistent = True
        conn = self.HTTP_CONN
        conn.putrequest("GET", "/timeout?t=%s" % timeout, skip_host=True)
        conn.putheader("Host", self.HOST)
        conn.endheaders()
        response = conn.response_class(conn.sock, method="GET")
        response.begin()
        self.assertEqual(response.status, 200)
        self.body = response.read()
        self.assertBody(str(timeout))

        # Make a second request on the same socket
        conn._output(ntob('GET /hello HTTP/1.1'))
        conn._output(ntob("Host: %s" % self.HOST, 'ascii'))
        conn._send_output()
        response = conn.response_class(conn.sock, method="GET")
        response.begin()
        self.assertEqual(response.status, 200)
        self.body = response.read()
        self.assertBody("Hello, world!")

        # Wait for our socket timeout
        time.sleep(timeout * 2)

        # Make another request on the same socket, which should error
        conn._output(ntob('GET /hello HTTP/1.1'))
        conn._output(ntob("Host: %s" % self.HOST, 'ascii'))
        conn._send_output()
        response = conn.response_class(conn.sock, method="GET")
        try:
            response.begin()
        except:
            if not isinstance(sys.exc_info()[1],
                              (socket.error, BadStatusLine)):
                self.fail("Writing to timed out socket didn't fail"
                          " as it should have: %s" % sys.exc_info()[1])
        else:
            if response.status != 408:
                self.fail("Writing to timed out socket didn't fail"
                          " as it should have: %s" %
                          response.read())

        conn.close()

        # Make another request on a new socket, which should work
        self.persistent = True
        conn = self.HTTP_CONN
        conn.putrequest("GET", "/", skip_host=True)
        conn.putheader("Host", self.HOST)
        conn.endheaders()
        response = conn.response_class(conn.sock, method="GET")
        response.begin()
        self.assertEqual(response.status, 200)
        self.body = response.read()
        self.assertBody(pov)

        # Make another request on the same socket,
        # but timeout on the headers
        conn.send(ntob('GET /hello HTTP/1.1'))
        # Wait for our socket timeout
        time.sleep(timeout * 2)
        response = conn.response_class(conn.sock, method="GET")
        try:
            response.begin()
        except:
            if not isinstance(sys.exc_info()[1],
                              (socket.error, BadStatusLine)):
                self.fail("Writing to timed out socket didn't fail"
                          " as it should have: %s" % sys.exc_info()[1])
        else:
            self.fail("Writing to timed out socket didn't fail"
                      " as it should have: %s" %
                      response.read())

        conn.close()

        # Retry the request on a new connection, which should work
        self.persistent = True
        conn = self.HTTP_CONN
        conn.putrequest("GET", "/", skip_host=True)
        conn.putheader("Host", self.HOST)
        conn.endheaders()
        response = conn.response_class(conn.sock, method="GET")
        response.begin()
        self.assertEqual(response.status, 200)
        self.body = response.read()
        self.assertBody(pov)
        conn.close()

    def test_HTTP11_pipelining(self):
        if cherrypy.server.protocol_version != "HTTP/1.1":
            return self.skip()

        self.PROTOCOL = "HTTP/1.1"

        # Test pipelining. httplib doesn't support this directly.
        self.persistent = True
        conn = self.HTTP_CONN

        # Put request 1
        conn.putrequest("GET", "/hello", skip_host=True)
        conn.putheader("Host", self.HOST)
        conn.endheaders()

        for trial in range(5):
            # Put next request
            conn._output(ntob('GET /hello HTTP/1.1'))
            conn._output(ntob("Host: %s" % self.HOST, 'ascii'))
            conn._send_output()

            # Retrieve previous response
            response = conn.response_class(conn.sock, method="GET")
            # there is a bug in python3 regarding the buffering of
            # ``conn.sock``. Until that bug get's fixed we will
            # monkey patch the ``reponse`` instance.
            # https://bugs.python.org/issue23377
            if py3k:
                response.fp = conn.sock.makefile("rb", 0)
            response.begin()
            body = response.read(13)
            self.assertEqual(response.status, 200)
            self.assertEqual(body, ntob("Hello, world!"))

        # Retrieve final response
        response = conn.response_class(conn.sock, method="GET")
        response.begin()
        body = response.read()
        self.assertEqual(response.status, 200)
        self.assertEqual(body, ntob("Hello, world!"))

        conn.close()

    def test_100_Continue(self):
        if cherrypy.server.protocol_version != "HTTP/1.1":
            return self.skip()

        self.PROTOCOL = "HTTP/1.1"

        self.persistent = True
        conn = self.HTTP_CONN

        # Try a page without an Expect request header first.
        # Note that httplib's response.begin automatically ignores
        # 100 Continue responses, so we must manually check for it.
        try:
            conn.putrequest("POST", "/upload", skip_host=True)
            conn.putheader("Host", self.HOST)
            conn.putheader("Content-Type", "text/plain")
            conn.putheader("Content-Length", "4")
            conn.endheaders()
            conn.send(ntob("d'oh"))
            response = conn.response_class(conn.sock, method="POST")
            version, status, reason = response._read_status()
            self.assertNotEqual(status, 100)
        finally:
            conn.close()

        # Now try a page with an Expect header...
        try:
            conn.connect()
            conn.putrequest("POST", "/upload", skip_host=True)
            conn.putheader("Host", self.HOST)
            conn.putheader("Content-Type", "text/plain")
            conn.putheader("Content-Length", "17")
            conn.putheader("Expect", "100-continue")
            conn.endheaders()
            response = conn.response_class(conn.sock, method="POST")

            # ...assert and then skip the 100 response
            version, status, reason = response._read_status()
            self.assertEqual(status, 100)
            while True:
                line = response.fp.readline().strip()
                if line:
                    self.fail(
                        "100 Continue should not output any headers. Got %r" %
                        line)
                else:
                    break

            # ...send the body
            body = ntob("I am a small file")
            conn.send(body)

            # ...get the final response
            response.begin()
            self.status, self.headers, self.body = webtest.shb(response)
            self.assertStatus(200)
            self.assertBody("thanks for '%s'" % body)
        finally:
            conn.close()


class ConnectionTests(helper.CPWebCase):
    setup_server = staticmethod(setup_server)

    def test_readall_or_close(self):
        if cherrypy.server.protocol_version != "HTTP/1.1":
            return self.skip()

        self.PROTOCOL = "HTTP/1.1"

        if self.scheme == "https":
            self.HTTP_CONN = HTTPSConnection
        else:
            self.HTTP_CONN = HTTPConnection

        # Test a max of 0 (the default) and then reset to what it was above.
        old_max = cherrypy.server.max_request_body_size
        for new_max in (0, old_max):
            cherrypy.server.max_request_body_size = new_max

            self.persistent = True
            conn = self.HTTP_CONN

            # Get a POST page with an error
            conn.putrequest("POST", "/err_before_read", skip_host=True)
            conn.putheader("Host", self.HOST)
            conn.putheader("Content-Type", "text/plain")
            conn.putheader("Content-Length", "1000")
            conn.putheader("Expect", "100-continue")
            conn.endheaders()
            response = conn.response_class(conn.sock, method="POST")

            # ...assert and then skip the 100 response
            version, status, reason = response._read_status()
            self.assertEqual(status, 100)
            while True:
                skip = response.fp.readline().strip()
                if not skip:
                    break

            # ...send the body
            conn.send(ntob("x" * 1000))

            # ...get the final response
            response.begin()
            self.status, self.headers, self.body = webtest.shb(response)
            self.assertStatus(500)

            # Now try a working page with an Expect header...
            conn._output(ntob('POST /upload HTTP/1.1'))
            conn._output(ntob("Host: %s" % self.HOST, 'ascii'))
            conn._output(ntob("Content-Type: text/plain"))
            conn._output(ntob("Content-Length: 17"))
            conn._output(ntob("Expect: 100-continue"))
            conn._send_output()
            response = conn.response_class(conn.sock, method="POST")

            # ...assert and then skip the 100 response
            version, status, reason = response._read_status()
            self.assertEqual(status, 100)
            while True:
                skip = response.fp.readline().strip()
                if not skip:
                    break

            # ...send the body
            body = ntob("I am a small file")
            conn.send(body)

            # ...get the final response
            response.begin()
            self.status, self.headers, self.body = webtest.shb(response)
            self.assertStatus(200)
            self.assertBody("thanks for '%s'" % body)
            conn.close()

    def test_No_Message_Body(self):
        if cherrypy.server.protocol_version != "HTTP/1.1":
            return self.skip()

        self.PROTOCOL = "HTTP/1.1"

        # Set our HTTP_CONN to an instance so it persists between requests.
        self.persistent = True

        # Make the first request and assert there's no "Connection: close".
        self.getPage("/")
        self.assertStatus('200 OK')
        self.assertBody(pov)
        self.assertNoHeader("Connection")

        # Make a 204 request on the same connection.
        self.getPage("/custom/204")
        self.assertStatus(204)
        self.assertNoHeader("Content-Length")
        self.assertBody("")
        self.assertNoHeader("Connection")

        # Make a 304 request on the same connection.
        self.getPage("/custom/304")
        self.assertStatus(304)
        self.assertNoHeader("Content-Length")
        self.assertBody("")
        self.assertNoHeader("Connection")

    def test_Chunked_Encoding(self):
        if cherrypy.server.protocol_version != "HTTP/1.1":
            return self.skip()

        if (hasattr(self, 'harness') and
                "modpython" in self.harness.__class__.__name__.lower()):
            # mod_python forbids chunked encoding
            return self.skip()

        self.PROTOCOL = "HTTP/1.1"

        # Set our HTTP_CONN to an instance so it persists between requests.
        self.persistent = True
        conn = self.HTTP_CONN

        # Try a normal chunked request (with extensions)
        body = ntob("8;key=value\r\nxx\r\nxxxx\r\n5\r\nyyyyy\r\n0\r\n"
                    "Content-Type: application/json\r\n"
                    "\r\n")
        conn.putrequest("POST", "/upload", skip_host=True)
        conn.putheader("Host", self.HOST)
        conn.putheader("Transfer-Encoding", "chunked")
        conn.putheader("Trailer", "Content-Type")
        # Note that this is somewhat malformed:
        # we shouldn't be sending Content-Length.
        # RFC 2616 says the server should ignore it.
        conn.putheader("Content-Length", "3")
        conn.endheaders()
        conn.send(body)
        response = conn.getresponse()
        self.status, self.headers, self.body = webtest.shb(response)
        self.assertStatus('200 OK')
        self.assertBody("thanks for '%s'" % ntob('xx\r\nxxxxyyyyy'))

        # Try a chunked request that exceeds server.max_request_body_size.
        # Note that the delimiters and trailer are included.
        body = ntob("3e3\r\n" + ("x" * 995) + "\r\n0\r\n\r\n")
        conn.putrequest("POST", "/upload", skip_host=True)
        conn.putheader("Host", self.HOST)
        conn.putheader("Transfer-Encoding", "chunked")
        conn.putheader("Content-Type", "text/plain")
        # Chunked requests don't need a content-length
##        conn.putheader("Content-Length", len(body))
        conn.endheaders()
        conn.send(body)
        response = conn.getresponse()
        self.status, self.headers, self.body = webtest.shb(response)
        self.assertStatus(413)
        conn.close()

    def test_Content_Length_in(self):
        # Try a non-chunked request where Content-Length exceeds
        # server.max_request_body_size. Assert error before body send.
        self.persistent = True
        conn = self.HTTP_CONN
        conn.putrequest("POST", "/upload", skip_host=True)
        conn.putheader("Host", self.HOST)
        conn.putheader("Content-Type", "text/plain")
        conn.putheader("Content-Length", "9999")
        conn.endheaders()
        response = conn.getresponse()
        self.status, self.headers, self.body = webtest.shb(response)
        self.assertStatus(413)
        self.assertBody("The entity sent with the request exceeds "
                        "the maximum allowed bytes.")
        conn.close()

    def test_Content_Length_out_preheaders(self):
        # Try a non-chunked response where Content-Length is less than
        # the actual bytes in the response body.
        self.persistent = True
        conn = self.HTTP_CONN
        conn.putrequest("GET", "/custom_cl?body=I+have+too+many+bytes&cl=5",
                        skip_host=True)
        conn.putheader("Host", self.HOST)
        conn.endheaders()
        response = conn.getresponse()
        self.status, self.headers, self.body = webtest.shb(response)
        self.assertStatus(500)
        self.assertBody(
            "The requested resource returned more bytes than the "
            "declared Content-Length.")
        conn.close()

    def test_Content_Length_out_postheaders(self):
        # Try a non-chunked response where Content-Length is less than
        # the actual bytes in the response body.
        self.persistent = True
        conn = self.HTTP_CONN
        conn.putrequest(
            "GET", "/custom_cl?body=I+too&body=+have+too+many&cl=5",
            skip_host=True)
        conn.putheader("Host", self.HOST)
        conn.endheaders()
        response = conn.getresponse()
        self.status, self.headers, self.body = webtest.shb(response)
        self.assertStatus(200)
        self.assertBody("I too")
        conn.close()

    def test_598(self):
        remote_data_conn = urlopen('%s://%s:%s/one_megabyte_of_a/' %
                                   (self.scheme, self.HOST, self.PORT,))
        buf = remote_data_conn.read(512)
        time.sleep(timeout * 0.6)
        remaining = (1024 * 1024) - 512
        while remaining:
            data = remote_data_conn.read(remaining)
            if not data:
                break
            else:
                buf += data
            remaining -= len(data)

        self.assertEqual(len(buf), 1024 * 1024)
        self.assertEqual(buf, ntob("a" * 1024 * 1024))
        self.assertEqual(remaining, 0)
        remote_data_conn.close()


def setup_upload_server():

    class Root:
        def upload(self):
            if not cherrypy.request.method == 'POST':
                raise AssertionError("'POST' != request.method %r" %
                                     cherrypy.request.method)
            return "thanks for '%s'" % tonative(cherrypy.request.body.read())
        upload.exposed = True

    cherrypy.tree.mount(Root())
    cherrypy.config.update({
        'server.max_request_body_size': 1001,
        'server.socket_timeout': 10,
        'server.accepted_queue_size': 5,
        'server.accepted_queue_timeout': 0.1,
    })

reset_names = 'ECONNRESET', 'WSAECONNRESET'
socket_reset_errors = [
    getattr(errno, name)
    for name in reset_names
    if hasattr(errno, name)
]
"reset error numbers available on this platform"

socket_reset_errors += [
    # Python 3.5 raises an http.client.RemoteDisconnected
    # with this message
    "Remote end closed connection without response",
]


class LimitedRequestQueueTests(helper.CPWebCase):
    setup_server = staticmethod(setup_upload_server)

    def test_queue_full(self):
        conns = []
        overflow_conn = None

        try:
            # Make 15 initial requests and leave them open, which should use
            # all of wsgiserver's WorkerThreads and fill its Queue.
            for i in range(15):
                conn = self.HTTP_CONN(self.HOST, self.PORT)
                conn.putrequest("POST", "/upload", skip_host=True)
                conn.putheader("Host", self.HOST)
                conn.putheader("Content-Type", "text/plain")
                conn.putheader("Content-Length", "4")
                conn.endheaders()
                conns.append(conn)

            # Now try a 16th conn, which should be closed by the server immediately.
            overflow_conn = self.HTTP_CONN(self.HOST, self.PORT)
            # Manually connect since httplib won't let us set a timeout
            for res in socket.getaddrinfo(self.HOST, self.PORT, 0,
                                          socket.SOCK_STREAM):
                af, socktype, proto, canonname, sa = res
                overflow_conn.sock = socket.socket(af, socktype, proto)
                overflow_conn.sock.settimeout(5)
                overflow_conn.sock.connect(sa)
                break

            overflow_conn.putrequest("GET", "/", skip_host=True)
            overflow_conn.putheader("Host", self.HOST)
            overflow_conn.endheaders()
            response = overflow_conn.response_class(overflow_conn.sock, method="GET")
            try:
                response.begin()
            except socket.error as exc:
                if exc.args[0] in socket_reset_errors:
                    pass # Expected.
                else:
                    tmpl = (
                        "Overflow conn did not get RST. "
                        "Got {exc.args!r} instead"
                    )
                    raise AssertionError(tmpl.format(**locals()))
            except BadStatusLine:
                # This is a special case in OS X. Linux and Windows will
                # RST correctly.
                assert sys.platform == 'darwin'
            else:
                raise AssertionError("Overflow conn did not get RST ")
        finally:
            for conn in conns:
                conn.send(ntob("done"))
                response = conn.response_class(conn.sock, method="POST")
                response.begin()
                self.body = response.read()
                self.assertBody("thanks for 'done'")
                self.assertEqual(response.status, 200)
                conn.close()
            if overflow_conn:
                overflow_conn.close()

class BadRequestTests(helper.CPWebCase):
    setup_server = staticmethod(setup_server)

    def test_No_CRLF(self):
        self.persistent = True

        conn = self.HTTP_CONN
        conn.send(ntob('GET /hello HTTP/1.1\n\n'))
        response = conn.response_class(conn.sock, method="GET")
        response.begin()
        self.body = response.read()
        self.assertBody("HTTP requires CRLF terminators")
        conn.close()

        conn.connect()
        conn.send(ntob('GET /hello HTTP/1.1\r\n\n'))
        response = conn.response_class(conn.sock, method="GET")
        response.begin()
        self.body = response.read()
        self.assertBody("HTTP requires CRLF terminators")
        conn.close()