Hi, I was trying a simple WebSocket test case in development branch. It doesn't seem working. Could you please check what's wrong with test case? // Server: #include <assert.h> #include <unistd.h> #include <string.h> #include <pthread.h> #include <stdio.h> #include <nanomsg/nn.h> #include <nanomsg/reqrep.h> int main (const int argc, const char **argv) { int sock = nn_socket (AF_SP, NN_REP); assert (sock >= 0); assert (nn_bind (sock, "ws://127.0.0.1:80") >= 0); while (1) { char *buf = NULL; int bytes = nn_recv (sock, &buf, NN_MSG, 0); assert (bytes >= 0); printf ("RECEIVED :%s\n", buf); bytes = nn_send (sock, "Hello", 5, 0); nn_freemsg (buf); } return nn_shutdown (sock, 0); } Client: <!DOCTYPE HTML> <html> <head> <script type="text/javascript"> function WebSocketTest() { if ("WebSocket" in window) { alert("WebSocket is supported by your Browser!"); // Let us open a web socket var ws = new WebSocket("ws://127.0.0.1:80", ["rep.sp.nanomsg.org"]); ws.onopen = function() { // Web Socket is connected, send data using send() alert("Message is sent..."); ws.send("Message"); }; ws.onmessage = function (evt) { var received_msg = evt.data; alert("Message is received..."); }; ws.onclose = function() { // websocket is closed. alert("Connection is closed..."); }; } else { // The browser doesn't support WebSocket alert("WebSocket NOT supported by your Browser!"); } } </script> </head> <body> <div id="sse"> <a href="javascript:WebSocketTest()">Run WebSocket</a> </div> </body> </html> Server Output: $ sudo ./nanoweb <No Output> Client Header: Request URL:ws://127.0.0.1/ Request Method:GET Status Code:101 Switching Protocols Request Headersview source Accept-Encoding:gzip,deflate,sdch Accept-Language:en-US,en;q=0.8 Cache-Control:no-cache Connection:Upgrade Host:127.0.0.1 Origin:null Pragma:no-cache Sec-WebSocket-Extensions:permessage-deflate; client_max_window_bits Sec-WebSocket-Key:q6rlJc/CM99JcAnRPtXuxQ== Sec-WebSocket-Protocol:rep.sp.nanomsg.org Sec-WebSocket-Version:13 Upgrade:websocket User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.111 Safari/537.36 Response Headersview source Connection:Upgrade Sec-WebSocket-Accept:jUk7KfyHAecXruo3DkLQMgeHNZc= Sec-WebSocket-Protocol:rep.sp.nanomsg.org Upgrade:websocket Regards, Prem