WebSocket onmessage 未触发 [英] WebSocket onmessage not firing

问题描述

我正在尝试实现我自己的 websocket 服务器，但在 JavaScript 中的 onmessage 函数遇到了一些麻烦.就是不会火！我将警报放入其中以在调用时触发并且警报永远不会出现.我在 firefox 和 chrome 上都试过了，但无济于事.

据我所知，我的服务器也发送了正确的消息，当我将其转换为十六进制时，它与此处文档第 5.7 节中的示例完全匹配:

http://datatracker.ietf.org/doc/rfc6455/?include_text=1

所以我不完全确定我做错了什么.握手工作正常，关闭也是如此.这是我当前发送消息的代码:

formatted_bytes = []formatted_bytes.append(129)message_bytes = bytearray( 消息)数据开始 = 0如果 ( len( message_bytes ) <= 125 ):formatted_bytes.append(len(message_bytes))开始 = 2对于 message_bytes 中的字节:formatted_bytes.append( 字节 )client_socket.send( bytes( formatted_bytes ) )

服务器是用python写的，忘了说了.

解决方案

这与您的其他问题的答案相同:向websocket客户端发送消息时压缩位必须为0

你的问题是你在 python 2.X 中使用了 bytes 函数，但希望它像在 python 3.X 中那样工作

python2.6.6:

<预><代码>>>>字节([129, 19])'[129, 19]'

蟒蛇 3:

<预><代码>>>>字节([129, 19])b'\x81\x13'

通过在您的服务器代码中用以下内容替换发送，它在 python2.X 中对我有用:

client_socket.send( "".join( [chr(c) for c in formatted_bytes] )

其他一些注意事项:

• 您链接的代码将消息长度加 1，这是不正确的.

• 你真的应该将握手代码与普通的消息解析代码分开.如果有人碰巧发送了一条包含Sec-WebSocket-Key:"的消息，您最终会再次发送原始握手来破坏流.

I'm trying to implement my own websocket server and am running into a bit of trouble with the onmessage function in the JavaScript. It just won't fire! I put an alert into it to trigger whenever it was called and the alert never comes up. I've tried on both firefox and chrome to no avail.

As far as I can tell, my server is sending the correct message as well, when I translate it into hex, it matches perfectly with the example in section 5.7 of the documentation here:

http://datatracker.ietf.org/doc/rfc6455/?include_text=1

So I'm not entirely sure what I'm doing wrong. The handshake works fine and so does the close. Here is my code for sending a message currently:

formatted_bytes = []
formatted_bytes.append( 129 )

message_bytes = bytearray( message )

data_start = 0

if ( len( message_bytes ) <= 125 ):
    formatted_bytes.append( len( message_bytes ) )
    start = 2

for byte in message_bytes:
    formatted_bytes.append( byte )

client_socket.send( bytes( formatted_bytes ) )

The server is written in python, forgot to mention that.

解决方案

This is the same answer as for your other question: Compressed bit must be 0 when sending a message to websocket client

You're problem is that you are using the bytes function in python 2.X but expecting it to work the way it does in python 3.X

python2.6.6:

>>> bytes([129, 19])
'[129, 19]'

python 3:

>>> bytes([129, 19])
b'\x81\x13'

By replacing the send with the following in your server code it works for me in python2.X:

client_socket.send( "".join( [chr(c) for c in formatted_bytes] )

A couple of other notes:

• The code you linked to is adding 1 to the message length which is incorrect.

• You should really have the handshake code separate from the normal message parsing code. If somebody happened to send a message which contained "Sec-WebSocket-Key: " you would end up corrupting the stream by sending a raw handshake back again.

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