[英]Python / JavaScript - WebSockets connection problem
我在使用WebSockets服務器時遇到了幾個錯誤。
以前,我在建立連接時確認服務器時遇到了很多問題。 在綁定地址中,我有一個等於0.0.0.0
的空字符串,所以我認為問題可能來自那里。 目前,客戶端只能在服務器停止time
異步 function 時知道它已連接。 我有時會收到錯誤
send.html:14 WebSocket connection to ws://86.205.245.32:5678/ failed: WebSocket opening handshake timed out
但很少。
我有很多問題可以回答這個帖子。
可以使用子協議幫助嗎? 如果是,如何將它與 Python 服務器一起使用?
可以使用 WSS 幫助嗎?
我是否需要將0.0.0.0
的綁定 IP 更改為另一個?
服務器
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()
服務器的回溯
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
客戶端
<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 請求
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 ,因為我的網絡很奇怪,有很多保護,所以我認為將服務器置於非軍事區會有所幫助。 目前,我無法告訴您它是否有幫助,因為目前當客戶端執行第1* see on the client code
,它無法連接到服務器。 奇怪的是,Windows電腦上沒有DMZ和服務器,都是一樣的,只是為了發送數據,客戶端只有在服務器關閉連接時才能看到服務器的數據。
我嘗試了什么
當我在客戶端執行期間關閉服務器時,我經常遇到這個問題,即使它沒有執行打印print("connect")
的阻塞time
:
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()]>>
我還按如下方式更改了客戶端的代碼,但沒有成功。
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
一台Windows電腦(客戶端)
樹莓派(服務器)
感謝您的幫助,讓我知道您是否已經遇到此問題以及您采取了哪些措施來解決它。 或者,如果您在代碼中發現可能導致此類問題的錯誤
謝謝
我試圖重現您的問題,但我認為您的問題是由您的網絡基礎設施引起的。
服務端和客戶端都很基礎,運行流暢。
將您的問題分為不同的階段:
localhost
中的客戶端和服務器)一些建議可能是:
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