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285 lines
11 KiB
Python
285 lines
11 KiB
Python
#!/usr/bin/env python
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#
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# Copyright 2009 Facebook
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""A non-blocking, single-threaded HTTP server.
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Typical applications have little direct interaction with the `HTTPServer`
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class except to start a server at the beginning of the process
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(and even that is often done indirectly via `tornado.web.Application.listen`).
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.. versionchanged:: 4.0
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The ``HTTPRequest`` class that used to live in this module has been moved
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to `tornado.httputil.HTTPServerRequest`. The old name remains as an alias.
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"""
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from __future__ import absolute_import, division, print_function, with_statement
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import socket
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from tornado.escape import native_str
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from tornado.http1connection import HTTP1ServerConnection, HTTP1ConnectionParameters
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from tornado import gen
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from tornado import httputil
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from tornado import iostream
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from tornado import netutil
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from tornado.tcpserver import TCPServer
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class HTTPServer(TCPServer, httputil.HTTPServerConnectionDelegate):
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r"""A non-blocking, single-threaded HTTP server.
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A server is defined by a subclass of `.HTTPServerConnectionDelegate`,
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or, for backwards compatibility, a callback that takes an
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`.HTTPServerRequest` as an argument. The delegate is usually a
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`tornado.web.Application`.
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`HTTPServer` supports keep-alive connections by default
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(automatically for HTTP/1.1, or for HTTP/1.0 when the client
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requests ``Connection: keep-alive``).
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If ``xheaders`` is ``True``, we support the
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``X-Real-Ip``/``X-Forwarded-For`` and
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``X-Scheme``/``X-Forwarded-Proto`` headers, which override the
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remote IP and URI scheme/protocol for all requests. These headers
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are useful when running Tornado behind a reverse proxy or load
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balancer. The ``protocol`` argument can also be set to ``https``
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if Tornado is run behind an SSL-decoding proxy that does not set one of
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the supported ``xheaders``.
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To make this server serve SSL traffic, send the ``ssl_options`` dictionary
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argument with the arguments required for the `ssl.wrap_socket` method,
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including ``certfile`` and ``keyfile``. (In Python 3.2+ you can pass
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an `ssl.SSLContext` object instead of a dict)::
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HTTPServer(applicaton, ssl_options={
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"certfile": os.path.join(data_dir, "mydomain.crt"),
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"keyfile": os.path.join(data_dir, "mydomain.key"),
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})
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`HTTPServer` initialization follows one of three patterns (the
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initialization methods are defined on `tornado.tcpserver.TCPServer`):
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1. `~tornado.tcpserver.TCPServer.listen`: simple single-process::
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server = HTTPServer(app)
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server.listen(8888)
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IOLoop.instance().start()
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In many cases, `tornado.web.Application.listen` can be used to avoid
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the need to explicitly create the `HTTPServer`.
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2. `~tornado.tcpserver.TCPServer.bind`/`~tornado.tcpserver.TCPServer.start`:
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simple multi-process::
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server = HTTPServer(app)
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server.bind(8888)
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server.start(0) # Forks multiple sub-processes
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IOLoop.instance().start()
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When using this interface, an `.IOLoop` must *not* be passed
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to the `HTTPServer` constructor. `~.TCPServer.start` will always start
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the server on the default singleton `.IOLoop`.
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3. `~tornado.tcpserver.TCPServer.add_sockets`: advanced multi-process::
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sockets = tornado.netutil.bind_sockets(8888)
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tornado.process.fork_processes(0)
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server = HTTPServer(app)
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server.add_sockets(sockets)
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IOLoop.instance().start()
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The `~.TCPServer.add_sockets` interface is more complicated,
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but it can be used with `tornado.process.fork_processes` to
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give you more flexibility in when the fork happens.
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`~.TCPServer.add_sockets` can also be used in single-process
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servers if you want to create your listening sockets in some
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way other than `tornado.netutil.bind_sockets`.
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.. versionchanged:: 4.0
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Added ``decompress_request``, ``chunk_size``, ``max_header_size``,
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``idle_connection_timeout``, ``body_timeout``, ``max_body_size``
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arguments. Added support for `.HTTPServerConnectionDelegate`
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instances as ``request_callback``.
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.. versionchanged:: 4.1
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`.HTTPServerConnectionDelegate.start_request` is now called with
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two arguments ``(server_conn, request_conn)`` (in accordance with the
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documentation) instead of one ``(request_conn)``.
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"""
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def __init__(self, request_callback, no_keep_alive=False, io_loop=None,
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xheaders=False, ssl_options=None, protocol=None,
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decompress_request=False,
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chunk_size=None, max_header_size=None,
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idle_connection_timeout=None, body_timeout=None,
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max_body_size=None, max_buffer_size=None):
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self.request_callback = request_callback
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self.no_keep_alive = no_keep_alive
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self.xheaders = xheaders
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self.protocol = protocol
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self.conn_params = HTTP1ConnectionParameters(
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decompress=decompress_request,
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chunk_size=chunk_size,
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max_header_size=max_header_size,
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header_timeout=idle_connection_timeout or 3600,
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max_body_size=max_body_size,
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body_timeout=body_timeout)
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TCPServer.__init__(self, io_loop=io_loop, ssl_options=ssl_options,
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max_buffer_size=max_buffer_size,
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read_chunk_size=chunk_size)
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self._connections = set()
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@gen.coroutine
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def close_all_connections(self):
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while self._connections:
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# Peek at an arbitrary element of the set
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conn = next(iter(self._connections))
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yield conn.close()
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def handle_stream(self, stream, address):
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context = _HTTPRequestContext(stream, address,
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self.protocol)
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conn = HTTP1ServerConnection(
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stream, self.conn_params, context)
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self._connections.add(conn)
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conn.start_serving(self)
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def start_request(self, server_conn, request_conn):
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return _ServerRequestAdapter(self, server_conn, request_conn)
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def on_close(self, server_conn):
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self._connections.remove(server_conn)
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class _HTTPRequestContext(object):
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def __init__(self, stream, address, protocol):
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self.address = address
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self.protocol = protocol
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# Save the socket's address family now so we know how to
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# interpret self.address even after the stream is closed
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# and its socket attribute replaced with None.
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if stream.socket is not None:
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self.address_family = stream.socket.family
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else:
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self.address_family = None
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# In HTTPServerRequest we want an IP, not a full socket address.
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if (self.address_family in (socket.AF_INET, socket.AF_INET6) and
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address is not None):
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self.remote_ip = address[0]
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else:
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# Unix (or other) socket; fake the remote address.
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self.remote_ip = '0.0.0.0'
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if protocol:
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self.protocol = protocol
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elif isinstance(stream, iostream.SSLIOStream):
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self.protocol = "https"
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else:
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self.protocol = "http"
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self._orig_remote_ip = self.remote_ip
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self._orig_protocol = self.protocol
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def __str__(self):
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if self.address_family in (socket.AF_INET, socket.AF_INET6):
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return self.remote_ip
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elif isinstance(self.address, bytes):
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# Python 3 with the -bb option warns about str(bytes),
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# so convert it explicitly.
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# Unix socket addresses are str on mac but bytes on linux.
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return native_str(self.address)
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else:
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return str(self.address)
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def _apply_xheaders(self, headers):
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"""Rewrite the ``remote_ip`` and ``protocol`` fields."""
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# Squid uses X-Forwarded-For, others use X-Real-Ip
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ip = headers.get("X-Forwarded-For", self.remote_ip)
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ip = ip.split(',')[-1].strip()
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ip = headers.get("X-Real-Ip", ip)
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if netutil.is_valid_ip(ip):
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self.remote_ip = ip
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# AWS uses X-Forwarded-Proto
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proto_header = headers.get(
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"X-Scheme", headers.get("X-Forwarded-Proto",
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self.protocol))
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if proto_header in ("http", "https"):
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self.protocol = proto_header
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def _unapply_xheaders(self):
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"""Undo changes from `_apply_xheaders`.
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Xheaders are per-request so they should not leak to the next
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request on the same connection.
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"""
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self.remote_ip = self._orig_remote_ip
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self.protocol = self._orig_protocol
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class _ServerRequestAdapter(httputil.HTTPMessageDelegate):
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"""Adapts the `HTTPMessageDelegate` interface to the interface expected
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by our clients.
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"""
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def __init__(self, server, server_conn, request_conn):
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self.server = server
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self.connection = request_conn
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self.request = None
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if isinstance(server.request_callback,
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httputil.HTTPServerConnectionDelegate):
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self.delegate = server.request_callback.start_request(
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server_conn, request_conn)
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self._chunks = None
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else:
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self.delegate = None
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self._chunks = []
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def headers_received(self, start_line, headers):
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if self.server.xheaders:
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self.connection.context._apply_xheaders(headers)
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if self.delegate is None:
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self.request = httputil.HTTPServerRequest(
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connection=self.connection, start_line=start_line,
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headers=headers)
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else:
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return self.delegate.headers_received(start_line, headers)
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def data_received(self, chunk):
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if self.delegate is None:
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self._chunks.append(chunk)
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else:
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return self.delegate.data_received(chunk)
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def finish(self):
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if self.delegate is None:
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self.request.body = b''.join(self._chunks)
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self.request._parse_body()
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self.server.request_callback(self.request)
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else:
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self.delegate.finish()
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self._cleanup()
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def on_connection_close(self):
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if self.delegate is None:
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self._chunks = None
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else:
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self.delegate.on_connection_close()
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self._cleanup()
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def _cleanup(self):
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if self.server.xheaders:
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self.connection.context._unapply_xheaders()
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HTTPRequest = httputil.HTTPServerRequest
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