Python模块和IIS作为反向代理

Question

我在localhost:5005上运行websocket模块的python服务器。来自文件页的代码

#!/usr/bin/env python

import asyncio
import websockets
import logging

logger = logging.getLogger('websockets')
logger.setLevel(logging.DEBUG)
logger.addHandler(logging.StreamHandler())

async def echo(websocket):
    async for message in websocket:
        print(message)
        await websocket.send(message)

async def main():
    async with websockets.serve(echo, "localhost", 5005):
        await asyncio.Future()  # run forever

asyncio.run(main())

客户端可以通过连接到URL ws://localhost:5005来访问它。websockets模块文件页中给出了一个示例客户端代码。

目标是使客户端能够通过充当反向代理的IIS (Windows本机via服务器)访问服务器，即通过URL。

IIS-10设置

• 应用程序请求路由缓存->服务器代理设置 --> 启用代理
• ->默认网站：我添加了一个名为app的应用程序
• URL重写：我添加了以下规则：

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <rule name="ReverseProxy" stopProcessing="true">
                    <match url="(.*)" />
                    <action type="Rewrite" url="http://localhost:5005" logRewrittenUrl="true" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>

一旦客户端尝试连接，它就会断开连接，服务器就会抛出此异常：

= connection is CONNECTING
< GET / HTTP/1.1
< Cache-Control: no-cache
< Connection: Upgrade
< Pragma: no-cache
< Upgrade: websocket
< Accept-Encoding: gzip, deflate, br, peerdist
< Accept-Language: en-US,en;q=0.9
< Host: localhost:5005
< Max-Forwards: 10
< User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36
< Origin: null
< Sec-WebSocket-Version: 13
< Sec-WebSocket-Key: /C9ah/z+wAo4mnoACSz2IA==
< Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits
< X-Original-URL: /app
< X-Forwarded-For: [::1]:52798
< X-ARR-LOG-ID: 8c59749a-4e5d-43cf-8a5a-c4421cc4ecc8
< X-P2P-PeerDist: Version=1.1
< X-P2P-PeerDistEx: MinContentInformation=1.0, MaxContentInformation=2.0
> HTTP/1.1 101 Switching Protocols
> Upgrade: websocket
> Connection: Upgrade
> Sec-WebSocket-Accept: W9Sttf7fHX3aB9zd4b/PVGt0Ldg=
> Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=12; client_max_window_bits=12
> Date: Fri, 15 Jul 2022 19:14:32 GMT
> Server: Python/3.7 websockets/10.3
connection open
= connection is OPEN
! failing connection with code 1006
= connection is CLOSED
x half-closing TCP connection
connection handler failed
Traceback (most recent call last):
  File "C:\Users\amin.ramezanifar\AppData\Roaming\Python\Python37\site-packages\websockets\legacy\protocol.py", line 945, in transfer_data
    message = await self.read_message()
  File "C:\Users\amin.ramezanifar\AppData\Roaming\Python\Python37\site-packages\websockets\legacy\protocol.py", line 1015, in read_message
    frame = await self.read_data_frame(max_size=self.max_size)
  File "C:\Users\amin.ramezanifar\AppData\Roaming\Python\Python37\site-packages\websockets\legacy\protocol.py", line 1090, in read_data_frame
    frame = await self.read_frame(max_size)
  File "C:\Users\amin.ramezanifar\AppData\Roaming\Python\Python37\site-packages\websockets\legacy\protocol.py", line 1149, in read_frame
    extensions=self.extensions,
  File "C:\Users\amin.ramezanifar\AppData\Roaming\Python\Python37\site-packages\websockets\legacy\framing.py", line 70, in read
    data = await reader(2)
  File "C:\Program Files\Python37\lib\asyncio\streams.py", line 677, in readexactly
    raise IncompleteReadError(incomplete, n)
asyncio.streams.IncompleteReadError: 0 bytes read on a total of 2 expected bytes
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "C:\Users\amin.ramezanifar\AppData\Roaming\Python\Python37\site-packages\websockets\legacy\server.py", line 232, in handler
    await self.ws_handler(self)
  File "D:/Robotic Framework/RoboticApps/UI_Framework/server.py", line 12, in echo
    async for message in websocket:
  File "C:\Users\amin.ramezanifar\AppData\Roaming\Python\Python37\site-packages\websockets\legacy\protocol.py", line 482, in __aiter__
    yield await self.recv()
  File "C:\Users\amin.ramezanifar\AppData\Roaming\Python\Python37\site-packages\websockets\legacy\protocol.py", line 553, in recv
    await self.ensure_open()
  File "C:\Users\amin.ramezanifar\AppData\Roaming\Python\Python37\site-packages\websockets\legacy\protocol.py", line 921, in ensure_open
    raise self.connection_closed_exc()
websockets.exceptions.ConnectionClosedError: no close frame received or sent
connection closed

为了确保IIS设置是否正确，我使用了来自这里的另一个名为"simple- websocket -server“的websocket库，它运行得很好。另外，我尝试了一个来自这里的简单的这里服务器，它成功了。

有什么不对的？

Answer 1

Amin (问题作者)和我发现您必须禁用websockets中的压缩，因为IIS不支持它。

它与其他库一起工作，因为它们不实现压缩或默认情况下不启用压缩，这与websockets不同。

有关详细信息，请参阅关于GitHub：https://github.com/aaugustin/websockets/issues/1192的讨论