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javascript - Python / JavaScript - WebSockets 连接问题

问题描述

我在使用WebSockets服务器时遇到了几个错误。

以前，我在建立连接时确认服务器时遇到了很多问题。在绑定地址中，我有一个等于的空字符串，0.0.0.0所以我认为问题可能来自那里。time目前，客户端只有在服务器停止异步功能时才能知道它已经连接。我有时会收到错误

send.html:14 WebSocket connection to ws://86.205.245.32:5678/ failed: WebSocket opening handshake timed out

但很少。

我有很多问题可以回答这个帖子。

服务器

print("start serveur")
import time, websockets, asyncio

async def time(websocket, path):
    print("connect")
    print(websocket)
    print(await websocket.recv())
start_server = websockets.serve(time, "", 5678)
loop=asyncio.get_event_loop() 

loop.run_until_complete(start_server)


loop.run_forever()

服务器的回溯

Error in connection handler
Traceback (most recent call last):
  File "/usr/lib/python3.5/asyncio/tasks.py", line 241, in _step
    result = coro.throw(exc)
  File "/usr/local/lib/python3.5/dist-packages/websockets/protocol.py", line 674, in transfer_data
    message = yield from self.read_message()
  File "/usr/local/lib/python3.5/dist-packages/websockets/protocol.py", line 742, in read_message
    frame = yield from self.read_data_frame(max_size=self.max_size)
  File "/usr/local/lib/python3.5/dist-packages/websockets/protocol.py", line 815, in read_data_frame
    frame = yield from self.read_frame(max_size)
  File "/usr/local/lib/python3.5/dist-packages/websockets/protocol.py", line 884, in read_frame
    extensions=self.extensions,
  File "/usr/local/lib/python3.5/dist-packages/websockets/framing.py", line 99, in read
    data = yield from reader(2)
  File "/usr/lib/python3.5/asyncio/streams.py", line 668, in readexactly
    yield from self._wait_for_data('readexactly')
  File "/usr/lib/python3.5/asyncio/streams.py", line 458, in _wait_for_data
    yield from self._waiter
  File "/usr/lib/python3.5/asyncio/futures.py", line 380, in __iter__
    yield self  # This tells Task to wait for completion.
  File "/usr/lib/python3.5/asyncio/tasks.py", line 304, in _wakeup
    future.result()
  File "/usr/lib/python3.5/asyncio/futures.py", line 285, in result
    raise CancelledError
concurrent.futures._base.CancelledError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/websockets/server.py", line 169, in handler
    yield from self.ws_handler(self, path)
  File "webserveur.py", line 8, in time
    print(await websocket.recv())
  File "/usr/local/lib/python3.5/dist-packages/websockets/protocol.py", line 434, in recv
    yield from self.ensure_open()
  File "/usr/local/lib/python3.5/dist-packages/websockets/protocol.py", line 658, in ensure_open
    ) from self.transfer_data_exc
websockets.exceptions.ConnectionClosed: WebSocket connection is closed: code = 1006 (connection closed abnormally [internal]), no reason

客户端

<script>
    alert("hello");

    var ws = new WebSocket("ws://86.205.245.32:5678/"  );//1*
        
    ws.onopen = function (event) {
       alert("had a handshake answer that cause a connection");
       ws.send("hello");
    }

</script>

WebSockets 请求

General
Request URL: ws://86.205.245.32:5678/
Request Headers
Provisional headers are shown
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en;q=0.9,en-US;q=0.8,fr;q=0.7
Cache-Control: no-cache
Connection: Upgrade
Host: 86.205.245.32:5678
Origin: file://
Pragma: no-cache
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits
Sec-WebSocket-Key: M+CfTACesBfbhkWnFclrsA==
Sec-WebSocket-Version: 13
Upgrade: websocket
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36

我想使用DMZ，因为我的网络很奇怪，有很多保护，所以我认为将服务器置于非军事区会有所帮助。目前，我无法告诉您它是否有帮助，因为目前当客户端执行该行时1* see on the client code，它无法连接到服务器。奇怪的是，没有DMZ和Windows电脑上的服务器，都是一样的，只是为了发送数据，客户端只有在服务器关闭连接时才能看到服务器的数据。

我尝试了什么

当我在客户端执行期间关闭服务器时，我经常遇到这个问题，即使它没有执行time打印的块print("connect")：

Task was destroyed but it is pending!
task: <Task pending coro=<WebSocketServerProtocol.handler() running at /usr/local/lib/python3.5/dist-packages/websockets/server.py:117> wait_for=<Future pending cb=[Task._wakeup()]>>

我还按如下方式更改了客户端的代码，但没有成功。

var ws = new WebSocket("ws://86.205.245.32:5678/"),
        messages = document.createElement('ul');

        ws.onopen = function (event) {
        alert("connect");
        ws.send("hello");
        
        }

硬件

感谢您的帮助，让我知道您是否已经遇到此问题以及您采取了哪些措施来解决它。或者，如果您在代码中发现可能导致此类问题的错误

谢谢

标签： javascriptpythonwebsocketportforwardingdmz

解决方案

我试图重现您的问题，但我认为您的问题是由您的网络基础设施引起的。

服务端和客户端都很基础，运行流畅。

将您的问题分为不同的阶段：

  1. 使用您的本地环境调试代码（在您的 PC 上的客户端和服务器localhost）
  2. 使用您的本地网络在客户端和服务器之间进行第一次隔离
  3. 使用 Cloud Providers 上的一些免费计划来测试扩展网络（AWS、GCP、DigitalOcean）

一些建议可能是：

  • 完全禁用 Windows 防火墙
  • 检查您的 Linux 发行版（UFW、IPTables ......）上没有防火墙
  • 使用 Raspberry Pi 的 LAN IP 而不是其公共 IP 进行测试
  • 确保在Livebox Play中没有设置防火墙或某些路由规则

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