Golang : Serving HTTP and Websocket from different ports in a program example



Tags : golang web-socket HTTP port mux

Problem: For some reason you want to split the port use by your program to serve HTTP and Web-socket traffic. How to write one program that is able to listen and serve HTTP/Web-socket traffics on different ports? Solution: Setup a http.NewServeMux() and http.ListenAndServe() for one port and launch it as go-routine. For example, one go-routine for handling web socket traffic and main routine in the program to handle HTTP traffic. NOTE : Instead of web-socket, can you use for another HTTP server? Yes, of course. Here you go! package main import ( "fmt" "golang.org/x/net/websocket" "io" "net/http" ) func homeHandler(w http.ResponseWriter, r *http.Request) { html := `<!DOCTYPE html> <html> <head> <title>One HTTP and Websocket serve with different ports example</title> <script src="http://code.jquery.com/jquery-1.11.3.min.js"></script> <script> $(function() { var ws = new WebSocket("ws://localhost:8082/"); // use port 8082 instead of 8080 var $ul = $('#msg-list'); $('#sendBtn').click(function(){ var data = $('#name').val(); ws.send(data); console.log("Sending data to HTTP server via Websocket via port 8082 :" + data); $('<li>').text(data).appendTo($ul); ); ); </script> </head> <body> <input id="name" type="text" /> <input type="button" id="sendBtn" value="send"></input> <ul id="msg-list"></ul> </body></html>` w.Write([]byte(fmt.Sprintf(html))) func wsHandler(ws *websocket.Conn) { fmt.Println("Receive data from : ", ws.LocalAddr()) fmt.Println("Sending data to : ", ws.RemoteAddr()) // echo back io.Copy(ws, ws) func main() { mxWS := http.NewServeMux() mxWS.Handle("/", websocket.Handler(wsHandler)) fmt.Println("Listen and serve websocket on :8082") go func() { http.ListenAndServe(":8082", mxWS) () mxHTTP := http.NewServeMux() mxHTTP.HandleFunc("/", homeHandler) fmt.Println("Listen and serve HTTP on :8080") http.ListenAndServe(":8080", mxHTTP) Run the code and point your browser to http://localhost:8080. Open up the developer view to see the console messages. References: https://www.socketloop.com/tutorials/golang-web-javascript-to-server-side-websocket-example


Tags : golang web-socket HTTP port mux

By Adam Ng

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