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POWebsocket handshake problem using Python server
 

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  1. POWebsocket handshake problem using Python server
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    <p>This is a question regarding handshaking in <a href="http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76" rel="nofollow">Websocket Protocol 76</a>.</p> <p>I have written a client and server, but am having trouble getting the client to accept the handshake. I can see that it is being returned, but the client immediately closes the connection. I'm guessing that my md5sum response must be incorrect.</p> <p>As far as I can tell, I'm following the proper procedure, can anyone tell me what I am doing wrong?</p> <pre><code>def create_handshake_resp(handshake): # parse request final_line = "" lines = handshake.splitlines() for line in lines: parts = line.partition(":") if parts[0] == "Sec-WebSocket-Key1": key1 = parts[2] elif parts[0] == "Sec-WebSocket-Key2": key2 = parts[2] final_line = line #concat the keys and encrypt e = hashlib.md5() e.update(parse_key(key1)) e.update(parse_key(key2)) e.update(final_line) return "HTTP/1.1 101 WebSocket Protocol Handshake\r\nUpgrade: WebSocket\r\nConnection: Upgrade\r\nWebSocket-Origin: http://%s\r\nWebSocket-Location: ws://%s/\r\nWebSocket-Protocol: sample\r\n\r\n%s" % (httphost, sockethost, e.digest()) def parse_key(key): spaces = -1 digits = "" for c in key: if c == " ": spaces += 1 if is_number(c): digits = digits + c new_key = int(digits) / spaces return str(new_key) </code></pre> <p>As you can see, I am performing what I think to be the correct operations on the keys (divide numbers by space count, concat results and the last line of the request and then MD5) and a 16 byte response is definitely being returned.</p> <p>Any help would be much appreciated, and as soon as I have a working copy I will post it here.</p> <p>Thanks.</p> <p>EDIT:</p> <p>Changed the headers to comply with kanaka's response. Handshake is still not being accepted by the client. I found out how to display the requests in Chromium, and this is the request and response being given:</p> <pre><code>(P) t=1291739663323 [st=3101] WEB_SOCKET_SEND_REQUEST_HEADERS --&gt; GET / HTTP/1.1 Upgrade: WebSocket Connection: Upgrade Host: --- Origin: http://--- Sec-WebSocket-Key1: 3E 203C 220 642; Sec-WebSocket-Key2: Lg 590 ~5 703O G7 =%t 9 \x74\x66\xef\xab\x50\x60\x35\xc6\x0a (P) t=1291739663324 [st=3102] SOCKET_STREAM_SENT (P) t=1291739663348 [st=3126] SOCKET_STREAM_RECEIVED (P) t=1291739663348 [st=3126] WEB_SOCKET_READ_RESPONSE_HEADERS --&gt; HTTP/1.1 101 WebSocket Protocol Handshake Upgrade: WebSocket Connection: Upgrade Sec-WebSocket-Origin: http://--- Sec-WebSocket-Location: ws://---/ Sec-WebSocket-Protocol: sample \xe7\x6f\xb9\xcf\xae\x70\x57\x43\xc6\x20\x85\xe7\x39\x2e\x83\xec\x0 </code></pre> <p>Ad verbatim, except I've removed the IP address for obvious reasons.</p>
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    1. COYour indentation doesn't make sense. I presume the lines `#concat`..`return` are meant to be in `create_handshake_resp`?
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    2. COSorry. Copy and paste mistake. Edited.
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    3. COYou needed the `spaces = -1` because you are not ignoring the first space after `:` in the header (e.g `Sec-WebSocket-Key1: a b` only contains one space, as far as the response is concerned). Doing `line.partition(": ")` prevents this
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