c# - The server returned status code '200' when status code '101' was expected in WebSockets -

i'm new web sockets, have written 1 sample c# console application web socket client , server. when connecting server client, receive above exception if specify httplistenerprefix url ip address either client or server (but not both). if specify machine name instead, worked expected.

server code:

    //server.start("http://inpsservice10:80/");     server.start("http://131.163.140.92:80/"); }  public async void start(string httplistenerprefix) {     httplistener httplistner = new httplistener();     httplistner.prefixes.add(httplistenerprefix);     httplistner.start();     console.writeline("listening");     while(true)     {         httplistenercontext httplistencontext = await httplistner.getcontextasync();         if (httplistencontext.request.iswebsocketrequest)             processrequest(httplistencontext);         else         {             httplistencontext.response.statuscode = 400;             httplistencontext.response.close();         }     } }  

client code:

connect("ws://131.163.140.92:80/").wait(); private static async task connect(string uri) {     thread.sleep(1000);     clientwebsocket websocket = null;     try     {         websocket = new clientwebsocket();         await websocket.connectasync(new uri(uri), cancellationtoken.none); //i'm getting exception here.         await task.whenall(receive(websocket), send(websocket));     }     catch (exception ex)     {         console.writeline("conenct: " + ex.message);     } }