4 # Copyright (C) 2007, 2008 Google Inc.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
32 from cStringIO import StringIO
34 from ganeti import constants
35 from ganeti import utils
38 HTTP_GANETI_VERSION = "Ganeti %s" % constants.RELEASE_VERSION
42 HTTP_NOT_MODIFIED = 304
52 HTTP_DELETE = "DELETE"
56 HTTP_SERVER = "Server"
58 HTTP_USER_AGENT = "User-Agent"
59 HTTP_CONTENT_TYPE = "Content-Type"
60 HTTP_CONTENT_LENGTH = "Content-Length"
61 HTTP_CONNECTION = "Connection"
62 HTTP_KEEP_ALIVE = "Keep-Alive"
63 HTTP_WWW_AUTHENTICATE = "WWW-Authenticate"
64 HTTP_AUTHORIZATION = "Authorization"
65 HTTP_AUTHENTICATION_INFO = "Authentication-Info"
68 HTTP_APP_OCTET_STREAM = "application/octet-stream"
69 HTTP_APP_JSON = "application/json"
71 _SSL_UNEXPECTED_EOF = "Unexpected EOF"
77 SOCKOP_HANDSHAKE) = range(4)
79 # send/receive quantum
83 class HttpError(Exception):
84 """Internal exception for HTTP errors.
86 This should only be used for internal error reporting.
91 class HttpConnectionClosed(Exception):
92 """Internal exception for a closed connection.
94 This should only be used for internal error reporting. Only use
95 it if there's no other way to report this condition.
100 class HttpSessionHandshakeUnexpectedEOF(HttpError):
101 """Internal exception for errors during SSL handshake.
103 This should only be used for internal error reporting.
108 class HttpSocketTimeout(Exception):
109 """Internal exception for socket timeouts.
111 This should only be used for internal error reporting.
116 class HttpException(Exception):
120 def __init__(self, message=None, headers=None):
121 Exception.__init__(self)
122 self.message = message
123 self.headers = headers
126 class HttpBadRequest(HttpException):
129 RFC2616, 10.4.1: The request could not be understood by the server
130 due to malformed syntax. The client SHOULD NOT repeat the request
131 without modifications.
137 class HttpUnauthorized(HttpException):
140 RFC2616, section 10.4.2: The request requires user
141 authentication. The response MUST include a WWW-Authenticate header
142 field (section 14.47) containing a challenge applicable to the
149 class HttpForbidden(HttpException):
152 RFC2616, 10.4.4: The server understood the request, but is refusing
153 to fulfill it. Authorization will not help and the request SHOULD
160 class HttpNotFound(HttpException):
163 RFC2616, 10.4.5: The server has not found anything matching the
164 Request-URI. No indication is given of whether the condition is
165 temporary or permanent.
171 class HttpMethodNotAllowed(HttpException):
172 """405 Method Not Allowed
174 RFC2616, 10.4.6: The method specified in the Request-Line is not
175 allowed for the resource identified by the Request-URI. The response
176 MUST include an Allow header containing a list of valid methods for
177 the requested resource.
183 class HttpNotAcceptable(HttpException):
184 """406 Not Acceptable
186 RFC2616, 10.4.7: The resource identified by the request is only capable of
187 generating response entities which have content characteristics not
188 acceptable according to the accept headers sent in the request.
194 class HttpRequestTimeout(HttpException):
195 """408 Request Timeout
197 RFC2616, 10.4.9: The client did not produce a request within the
198 time that the server was prepared to wait. The client MAY repeat the
199 request without modifications at any later time.
205 class HttpConflict(HttpException):
208 RFC2616, 10.4.10: The request could not be completed due to a
209 conflict with the current state of the resource. This code is only
210 allowed in situations where it is expected that the user might be
211 able to resolve the conflict and resubmit the request.
217 class HttpGone(HttpException):
220 RFC2616, 10.4.11: The requested resource is no longer available at
221 the server and no forwarding address is known. This condition is
222 expected to be considered permanent.
228 class HttpLengthRequired(HttpException):
229 """411 Length Required
231 RFC2616, 10.4.12: The server refuses to accept the request without a
232 defined Content-Length. The client MAY repeat the request if it adds
233 a valid Content-Length header field containing the length of the
234 message-body in the request message.
240 class HttpPreconditionFailed(HttpException):
241 """412 Precondition Failed
243 RFC2616, 10.4.13: The precondition given in one or more of the
244 request-header fields evaluated to false when it was tested on the
251 class HttpUnsupportedMediaType(HttpException):
252 """415 Unsupported Media Type
254 RFC2616, 10.4.16: The server is refusing to service the request because the
255 entity of the request is in a format not supported by the requested resource
256 for the requested method.
262 class HttpInternalServerError(HttpException):
263 """500 Internal Server Error
265 RFC2616, 10.5.1: The server encountered an unexpected condition
266 which prevented it from fulfilling the request.
272 class HttpNotImplemented(HttpException):
273 """501 Not Implemented
275 RFC2616, 10.5.2: The server does not support the functionality
276 required to fulfill the request.
282 class HttpBadGateway(HttpException):
285 RFC2616, 10.5.3: The server, while acting as a gateway or proxy,
286 received an invalid response from the upstream server it accessed in
287 attempting to fulfill the request.
293 class HttpServiceUnavailable(HttpException):
294 """503 Service Unavailable
296 RFC2616, 10.5.4: The server is currently unable to handle the
297 request due to a temporary overloading or maintenance of the server.
303 class HttpGatewayTimeout(HttpException):
304 """504 Gateway Timeout
306 RFC2616, 10.5.5: The server, while acting as a gateway or proxy, did
307 not receive a timely response from the upstream server specified by
308 the URI (e.g. HTTP, FTP, LDAP) or some other auxiliary server
309 (e.g. DNS) it needed to access in attempting to complete the
316 class HttpVersionNotSupported(HttpException):
317 """505 HTTP Version Not Supported
319 RFC2616, 10.5.6: The server does not support, or refuses to support,
320 the HTTP protocol version that was used in the request message.
326 def WaitForSocketCondition(sock, event, timeout):
327 """Waits for a condition to occur on the socket.
330 @param sock: Wait for events on this socket
332 @param event: ORed condition (see select module)
333 @type timeout: float or None
334 @param timeout: Timeout in seconds
336 @return: None for timeout, otherwise occured conditions
339 check = (event | select.POLLPRI |
340 select.POLLNVAL | select.POLLHUP | select.POLLERR)
342 if timeout is not None:
343 # Poller object expects milliseconds
346 poller = select.poll()
347 poller.register(sock, event)
350 # TODO: If the main thread receives a signal and we have no timeout, we
351 # could wait forever. This should check a global "quit" flag or
352 # something every so often.
353 io_events = poller.poll(timeout)
357 for (_, evcond) in io_events:
361 poller.unregister(sock)
364 def SocketOperation(sock, op, arg1, timeout):
365 """Wrapper around socket functions.
367 This function abstracts error handling for socket operations, especially
368 for the complicated interaction with OpenSSL.
371 @param sock: Socket for the operation
373 @param op: Operation to execute (SOCKOP_* constants)
375 @param arg1: Parameter for function (if needed)
376 @type timeout: None or float
377 @param timeout: Timeout in seconds or None
378 @return: Return value of socket function
381 # TODO: event_poll/event_check/override
382 if op in (SOCKOP_SEND, SOCKOP_HANDSHAKE):
383 event_poll = select.POLLOUT
385 elif op == SOCKOP_RECV:
386 event_poll = select.POLLIN
388 elif op == SOCKOP_SHUTDOWN:
391 # The timeout is only used when OpenSSL requests polling for a condition.
392 # It is not advisable to have no timeout for shutdown.
396 raise AssertionError("Invalid socket operation")
398 # Handshake is only supported by SSL sockets
399 if (op == SOCKOP_HANDSHAKE and
400 not isinstance(sock, OpenSSL.SSL.ConnectionType)):
403 # No override by default
407 # Poll only for certain operations and when asked for by an override
408 if event_override or op in (SOCKOP_SEND, SOCKOP_RECV, SOCKOP_HANDSHAKE):
410 wait_for_event = event_override
412 wait_for_event = event_poll
414 event = WaitForSocketCondition(sock, wait_for_event, timeout)
416 raise HttpSocketTimeout()
418 if (op == SOCKOP_RECV and
419 event & (select.POLLNVAL | select.POLLHUP | select.POLLERR)):
422 if not event & wait_for_event:
430 if op == SOCKOP_SEND:
431 return sock.send(arg1)
433 elif op == SOCKOP_RECV:
434 return sock.recv(arg1)
436 elif op == SOCKOP_SHUTDOWN:
437 if isinstance(sock, OpenSSL.SSL.ConnectionType):
438 # PyOpenSSL's shutdown() doesn't take arguments
439 return sock.shutdown()
441 return sock.shutdown(arg1)
443 elif op == SOCKOP_HANDSHAKE:
444 return sock.do_handshake()
446 except OpenSSL.SSL.WantWriteError:
447 # OpenSSL wants to write, poll for POLLOUT
448 event_override = select.POLLOUT
451 except OpenSSL.SSL.WantReadError:
452 # OpenSSL wants to read, poll for POLLIN
453 event_override = select.POLLIN | select.POLLPRI
456 except OpenSSL.SSL.WantX509LookupError:
459 except OpenSSL.SSL.ZeroReturnError, err:
460 # SSL Connection has been closed. In SSL 3.0 and TLS 1.0, this only
461 # occurs if a closure alert has occurred in the protocol, i.e. the
462 # connection has been closed cleanly. Note that this does not
463 # necessarily mean that the transport layer (e.g. a socket) has been
465 if op == SOCKOP_SEND:
466 # Can happen during a renegotiation
467 raise HttpConnectionClosed(err.args)
468 elif op == SOCKOP_RECV:
471 # SSL_shutdown shouldn't return SSL_ERROR_ZERO_RETURN
472 raise socket.error(err.args)
474 except OpenSSL.SSL.SysCallError, err:
475 if op == SOCKOP_SEND:
476 # arg1 is the data when writing
477 if err.args and err.args[0] == -1 and arg1 == "":
478 # errors when writing empty strings are expected
482 if err.args == (-1, _SSL_UNEXPECTED_EOF):
483 if op == SOCKOP_RECV:
485 elif op == SOCKOP_HANDSHAKE:
486 # Can happen if peer disconnects directly after the connection is
488 raise HttpSessionHandshakeUnexpectedEOF(err.args)
490 raise socket.error(err.args)
492 except OpenSSL.SSL.Error, err:
493 raise socket.error(err.args)
495 except socket.error, err:
496 if err.args and err.args[0] == errno.EAGAIN:
503 def ShutdownConnection(sock, close_timeout, write_timeout, msgreader, force):
504 """Closes the connection.
507 @param sock: Socket to be shut down
508 @type close_timeout: float
509 @param close_timeout: How long to wait for the peer to close
511 @type write_timeout: float
512 @param write_timeout: Write timeout for shutdown
513 @type msgreader: http.HttpMessageReader
514 @param msgreader: Request message reader, used to determine whether
515 peer should close connection
517 @param force: Whether to forcibly close the connection without
521 #print msgreader.peer_will_close, force
522 if msgreader and msgreader.peer_will_close and not force:
523 # Wait for peer to close
525 # Check whether it's actually closed
526 if not SocketOperation(sock, SOCKOP_RECV, 1, close_timeout):
528 except (socket.error, HttpError, HttpSocketTimeout):
529 # Ignore errors at this stage
532 # Close the connection from our side
534 # We don't care about the return value, see NOTES in SSL_shutdown(3).
535 SocketOperation(sock, SOCKOP_SHUTDOWN, socket.SHUT_RDWR,
537 except HttpSocketTimeout:
538 raise HttpError("Timeout while shutting down connection")
539 except socket.error, err:
541 if not (err.args and err.args[0] == errno.ENOTCONN):
542 raise HttpError("Error while shutting down connection: %s" % err)
545 def Handshake(sock, write_timeout):
546 """Shakes peer's hands.
549 @param sock: Socket to be shut down
550 @type write_timeout: float
551 @param write_timeout: Write timeout for handshake
555 return SocketOperation(sock, SOCKOP_HANDSHAKE, None, write_timeout)
556 except HttpSocketTimeout:
557 raise HttpError("Timeout during SSL handshake")
558 except socket.error, err:
559 raise HttpError("Error in SSL handshake: %s" % err)
563 """Initializes the SSL infrastructure.
565 This function is idempotent.
568 if not OpenSSL.rand.status():
569 raise EnvironmentError("OpenSSL could not collect enough entropy"
572 # TODO: Maybe add some additional seeding for OpenSSL's PRNG
575 class HttpSslParams(object):
576 """Data class for SSL key and certificate.
579 def __init__(self, ssl_key_path, ssl_cert_path):
580 """Initializes this class.
582 @type ssl_key_path: string
583 @param ssl_key_path: Path to file containing SSL key in PEM format
584 @type ssl_cert_path: string
585 @param ssl_cert_path: Path to file containing SSL certificate
589 self.ssl_key_pem = utils.ReadFile(ssl_key_path)
590 self.ssl_cert_pem = utils.ReadFile(ssl_cert_path)
593 return OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM,
596 def GetCertificate(self):
597 return OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM,
601 class HttpBase(object):
602 """Base class for HTTP server and client.
606 self.using_ssl = None
607 self._ssl_params = None
609 self._ssl_cert = None
611 def _CreateSocket(self, ssl_params, ssl_verify_peer):
612 """Creates a TCP socket and initializes SSL if needed.
614 @type ssl_params: HttpSslParams
615 @param ssl_params: SSL key and certificate
616 @type ssl_verify_peer: bool
617 @param ssl_verify_peer: Whether to require client certificate
618 and compare it with our certificate
621 self._ssl_params = ssl_params
623 sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
625 # Should we enable SSL?
626 self.using_ssl = ssl_params is not None
628 if not self.using_ssl:
631 self._ssl_key = ssl_params.GetKey()
632 self._ssl_cert = ssl_params.GetCertificate()
634 ctx = OpenSSL.SSL.Context(OpenSSL.SSL.SSLv23_METHOD)
635 ctx.set_options(OpenSSL.SSL.OP_NO_SSLv2)
637 ctx.use_privatekey(self._ssl_key)
638 ctx.use_certificate(self._ssl_cert)
639 ctx.check_privatekey()
642 ctx.set_verify(OpenSSL.SSL.VERIFY_PEER |
643 OpenSSL.SSL.VERIFY_FAIL_IF_NO_PEER_CERT,
644 self._SSLVerifyCallback)
646 return OpenSSL.SSL.Connection(ctx, sock)
648 def _SSLVerifyCallback(self, conn, cert, errnum, errdepth, ok):
649 """Verify the certificate provided by the peer
651 We only compare fingerprints. The client must use the same certificate as
655 # some parameters are unused, but this is the API
656 # pylint: disable-msg=W0613
657 assert self._ssl_params, "SSL not initialized"
659 return (self._ssl_cert.digest("sha1") == cert.digest("sha1") and
660 self._ssl_cert.digest("md5") == cert.digest("md5"))
663 class HttpMessage(object):
664 """Data structure for HTTP message.
668 self.start_line = None
673 class HttpClientToServerStartLine(object):
674 """Data structure for HTTP request start line.
677 def __init__(self, method, path, version):
680 self.version = version
683 return "%s %s %s" % (self.method, self.path, self.version)
686 class HttpServerToClientStartLine(object):
687 """Data structure for HTTP response start line.
690 def __init__(self, version, code, reason):
691 self.version = version
696 return "%s %s %s" % (self.version, self.code, self.reason)
699 class HttpMessageWriter(object):
700 """Writes an HTTP message to a socket.
703 def __init__(self, sock, msg, write_timeout):
704 """Initializes this class and writes an HTTP message to a socket.
707 @param sock: Socket to be written to
708 @type msg: http.HttpMessage
709 @param msg: HTTP message to be written
710 @type write_timeout: float
711 @param write_timeout: Write timeout for socket
716 self._PrepareMessage()
718 buf = self._FormatMessage()
723 # Send only SOCK_BUF_SIZE bytes at a time
724 data = buf[pos:(pos + SOCK_BUF_SIZE)]
726 sent = SocketOperation(sock, SOCKOP_SEND, data, write_timeout)
731 assert pos == end, "Message wasn't sent completely"
733 def _PrepareMessage(self):
734 """Prepares the HTTP message by setting mandatory headers.
737 # RFC2616, section 4.3: "The presence of a message-body in a request is
738 # signaled by the inclusion of a Content-Length or Transfer-Encoding header
739 # field in the request's message-headers."
741 self._msg.headers[HTTP_CONTENT_LENGTH] = len(self._msg.body)
743 def _FormatMessage(self):
744 """Serializes the HTTP message into a string.
750 buf.write(str(self._msg.start_line))
754 if self._msg.start_line.version != HTTP_0_9:
755 for name, value in self._msg.headers.iteritems():
756 buf.write("%s: %s\r\n" % (name, value))
760 # Add message body if needed
761 if self.HasMessageBody():
762 buf.write(self._msg.body)
765 logging.warning("Ignoring message body")
767 return buf.getvalue()
769 def HasMessageBody(self):
770 """Checks whether the HTTP message contains a body.
772 Can be overridden by subclasses.
775 return bool(self._msg.body)
778 class HttpMessageReader(object):
779 """Reads HTTP message from socket.
783 START_LINE_LENGTH_MAX = None
784 HEADER_LENGTH_MAX = None
786 # Parser state machine
787 PS_START_LINE = "start-line"
788 PS_HEADERS = "headers"
789 PS_BODY = "entity-body"
790 PS_COMPLETE = "complete"
792 def __init__(self, sock, msg, read_timeout):
793 """Reads an HTTP message from a socket.
796 @param sock: Socket to be read from
797 @type msg: http.HttpMessage
798 @param msg: Object for the read message
799 @type read_timeout: float
800 @param read_timeout: Read timeout for socket
806 self.start_line_buffer = None
807 self.header_buffer = StringIO()
808 self.body_buffer = StringIO()
809 self.parser_status = self.PS_START_LINE
810 self.content_length = None
811 self.peer_will_close = None
815 while self.parser_status != self.PS_COMPLETE:
816 # TODO: Don't read more than necessary (Content-Length), otherwise
817 # data might be lost and/or an error could occur
818 data = SocketOperation(sock, SOCKOP_RECV, SOCK_BUF_SIZE, read_timeout)
825 # Do some parsing and error checking while more data arrives
826 buf = self._ContinueParsing(buf, eof)
828 # Must be done only after the buffer has been evaluated
829 # TODO: Content-Length < len(data read) and connection closed
831 self.parser_status in (self.PS_START_LINE,
833 raise HttpError("Connection closed prematurely")
836 buf = self._ContinueParsing(buf, True)
838 assert self.parser_status == self.PS_COMPLETE
839 assert not buf, "Parser didn't read full response"
842 msg.body = self.body_buffer.getvalue()
844 def _ContinueParsing(self, buf, eof):
845 """Main function for HTTP message state machine.
848 @param buf: Receive buffer
850 @param eof: Whether we've reached EOF on the socket
852 @return: Updated receive buffer
855 # TODO: Use offset instead of slicing when possible
856 if self.parser_status == self.PS_START_LINE:
859 idx = buf.find("\r\n")
861 # RFC2616, section 4.1: "In the interest of robustness, servers SHOULD
862 # ignore any empty line(s) received where a Request-Line is expected.
863 # In other words, if the server is reading the protocol stream at the
864 # beginning of a message and receives a CRLF first, it should ignore
867 # TODO: Limit number of CRLFs/empty lines for safety?
872 self.start_line_buffer = buf[:idx]
874 self._CheckStartLineLength(len(self.start_line_buffer))
876 # Remove status line, including CRLF
879 self.msg.start_line = self.ParseStartLine(self.start_line_buffer)
881 self.parser_status = self.PS_HEADERS
883 # Check whether incoming data is getting too large, otherwise we just
884 # fill our read buffer.
885 self._CheckStartLineLength(len(buf))
889 # TODO: Handle messages without headers
890 if self.parser_status == self.PS_HEADERS:
891 # Wait for header end
892 idx = buf.find("\r\n\r\n")
894 self.header_buffer.write(buf[:idx + 2])
896 self._CheckHeaderLength(self.header_buffer.tell())
898 # Remove headers, including CRLF
903 self.parser_status = self.PS_BODY
905 # Check whether incoming data is getting too large, otherwise we just
906 # fill our read buffer.
907 self._CheckHeaderLength(len(buf))
909 if self.parser_status == self.PS_BODY:
910 # TODO: Implement max size for body_buffer
911 self.body_buffer.write(buf)
914 # Check whether we've read everything
916 # RFC2616, section 4.4: "When a message-body is included with a message,
917 # the transfer-length of that body is determined by one of the following
918 # [...] 5. By the server closing the connection. (Closing the connection
919 # cannot be used to indicate the end of a request body, since that would
920 # leave no possibility for the server to send back a response.)"
922 # TODO: Error when buffer length > Content-Length header
924 self.content_length is None or
925 (self.content_length is not None and
926 self.body_buffer.tell() >= self.content_length)):
927 self.parser_status = self.PS_COMPLETE
931 def _CheckStartLineLength(self, length):
932 """Limits the start line buffer size.
935 @param length: Buffer size
938 if (self.START_LINE_LENGTH_MAX is not None and
939 length > self.START_LINE_LENGTH_MAX):
940 raise HttpError("Start line longer than %d chars" %
941 self.START_LINE_LENGTH_MAX)
943 def _CheckHeaderLength(self, length):
944 """Limits the header buffer size.
947 @param length: Buffer size
950 if (self.HEADER_LENGTH_MAX is not None and
951 length > self.HEADER_LENGTH_MAX):
952 raise HttpError("Headers longer than %d chars" % self.HEADER_LENGTH_MAX)
954 def ParseStartLine(self, start_line):
955 """Parses the start line of a message.
957 Must be overridden by subclass.
959 @type start_line: string
960 @param start_line: Start line string
963 raise NotImplementedError()
965 def _WillPeerCloseConnection(self):
966 """Evaluate whether peer will close the connection.
969 @return: Whether peer will close the connection
972 # RFC2616, section 14.10: "HTTP/1.1 defines the "close" connection option
973 # for the sender to signal that the connection will be closed after
974 # completion of the response. For example,
978 # in either the request or the response header fields indicates that the
979 # connection SHOULD NOT be considered `persistent' (section 8.1) after the
980 # current request/response is complete."
982 hdr_connection = self.msg.headers.get(HTTP_CONNECTION, None)
984 hdr_connection = hdr_connection.lower()
986 # An HTTP/1.1 server is assumed to stay open unless explicitly closed.
987 if self.msg.start_line.version == HTTP_1_1:
988 return (hdr_connection and "close" in hdr_connection)
990 # Some HTTP/1.0 implementations have support for persistent connections,
991 # using rules different than HTTP/1.1.
993 # For older HTTP, Keep-Alive indicates persistent connection.
994 if self.msg.headers.get(HTTP_KEEP_ALIVE):
997 # At least Akamai returns a "Connection: Keep-Alive" header, which was
998 # supposed to be sent by the client.
999 if hdr_connection and "keep-alive" in hdr_connection:
1004 def _ParseHeaders(self):
1005 """Parses the headers.
1007 This function also adjusts internal variables based on header values.
1009 RFC2616, section 4.3: The presence of a message-body in a request is
1010 signaled by the inclusion of a Content-Length or Transfer-Encoding header
1011 field in the request's message-headers.
1015 self.header_buffer.seek(0, 0)
1016 self.msg.headers = mimetools.Message(self.header_buffer, 0)
1018 self.peer_will_close = self._WillPeerCloseConnection()
1020 # Do we have a Content-Length header?
1021 hdr_content_length = self.msg.headers.get(HTTP_CONTENT_LENGTH, None)
1022 if hdr_content_length:
1024 self.content_length = int(hdr_content_length)
1026 self.content_length = None
1027 if self.content_length is not None and self.content_length < 0:
1028 self.content_length = None
1030 # if the connection remains open and a content-length was not provided,
1031 # then assume that the connection WILL close.
1032 if self.content_length is None:
1033 self.peer_will_close = True