Simple websocket server in PHP
php, phpwebsocket, websocket
Solution
I had the same problem: for some messages sent from the server there was no response in the browser, for some the error "A server must not mask any frames ..." was displayed, though I did not add any mask. The reason was in the handshake sent. The handshake was:
"HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
...
"WebSocket-Location: ws://{$host}{$resource}\r\n\r\n" . chr(0)
That chr(0) was the reason, after I removed it everything works.
Problem
I am developing a simple websocket server in PHP. I know there are quite a few existing implementations but I want to make my own so to learn the protocol better. I managed to do the handshaking fine and my clients connect to the server. I also managed to decode the data from the client but I have problems sending back messages. The client disconnects when it receives my response. Firefox says `The connection to ws://localhost:12345/ was interrupted while the page was loading.`. I used this answer as a guide. Here is my code for wrapping the data: ``` private function wrap($msg = ""){ $length = strlen($msg); $this->log("wrapping (" . $length . " bytes): " . $msg); $bytesFormatted = chr(129); if($length <= 125){ $bytesFormatted .= chr($length); } else if($length >= 126 && $length <= 65535) { $bytesFormatted .= chr(126); $bytesFormatted .= chr(( $length >> 8 ) & 255); $bytesFormatted .= chr(( $length ) & 255); } else { $bytesFormatted .= chr(127); $bytesFormatted .= chr(( $length >> 56 ) & 255); $bytesFormatted .= chr(( $length >> 48 ) & 255); $bytesFormatted .= chr(( $length >> 40 ) & 255); $bytesFormatted .= chr(( $length >> 32 ) & 255); $bytesFormatted .= chr(( $length >> 24 ) & 255); $bytesFormatted .= chr(( $length >> 16 ) & 255); $bytesFormatted .= chr(( $length >> 8 ) & 255); $bytesFormatted .= chr(( $length ) & 255); } $bytesFormatted .= $msg; $this->log("wrapped (" . strlen($bytesFormatted) . " bytes): " . $bytesFormatted); return $bytesFormatted; } ``` UPDATE: I tried it with Chrome and I got the following error, printed in the console: `A server must not mask any frames that it sends to the client.` I put some console printouts on the server. It is a basic echo server. I try with `aaaa`. So the actual wrapped message must be 6 bytes. Right? Chrome prints the above error. Note also that after wrapping the message I simply write it to the socket: ``` $sent = socket_write($client, $bytesFormatted, strlen($bytesFormatted)); $this->say("! " . $sent); ``` It prints 6 meaning 6 bytes are actually written to the wire. If I try with `aaa`, Chrome doesn't print the error but doesn't call my onmessage handler either. It hangs as if waiting for more data. Any help highly appreciated. Thanks.