How to construct a WebSocket URI relative to the page URI

Question

I want to construct a WebSocket URI relative to the page URI at the browser side  Say  in my case convert HTTP URIs like  http   example com 8000 path https   example com 8000 path   to  ws   example com 8000 path to ws wss   example com 8000 path to ws   What I m doing currently is replace the first 4 letters  http  by  ws   and append   to ws  to it  Is there any better way for that

User · Answer

easy   location href replace   http    ws       to ws     or if you hate regexp  location href replace  http       ws      replace  https       wss          to ws

User · Answer

Assuming your WebSocket server is listening on the same port as from which the page is being requested  I would suggest   function createWebSocket path        var protocolPrefix    window location protocol      https       wss      ws        return new WebSocket protocolPrefix          location host   path       Then  for your case  call it as follows   var socket   createWebSocket location pathname     to ws

User · Answer

If your Web server has support for WebSockets  or a WebSocket handler module  then you can use the same host and port and just change the scheme like you are showing  There are many options for running a Web server and Websocket server module together   I would suggest that you look at the individual pieces of the window location global and join them back together instead of doing blind string substitution   var loc   window location  new uri  if  loc protocol      https          new uri    wss      else       new uri    ws      new uri           loc host  new uri    loc pathname     to ws     Note that some web servers  i e  Jetty based ones  currently use the path  rather than the upgrade header  to determine whether a specific request should be passed on to the WebSocket handler  So you may be limited in whether you can transform the path in the way you want

User · Answer

Using the Window URL API - https   developer mozilla org en-US docs Web API Window URL     Works with http s   ports etc   var url   new URL   path to websocket   window location href    url protocol   url protocol replace  http    ws     url href      gt  ws   www example com 9999 path to websocket

User · Answer

On localhost you should consider context path   function wsURL path        var protocol    location protocol      https       wss        ws          var url   protocol   location host      if location hostname      localhost             url          location pathname split      1      add context path           return url   path

User · Answer

Dead easy solution  ws and port  tested  var ws   new WebSocket  quot ws    quot    window location host    quot  6666 quot     ws onopen   function     ws send     etc

User · Answer

In typescript   export class WebsocketUtils        public static websocketUrlByPath path            return this websocketProtocolByLocation                 window location hostname               this websocketPortWithColonByLocation                 window location pathname               path             private static websocketProtocolByLocation             return window location protocol      https      wss        ws                 private static websocketPortWithColonByLocation             const defaultPort   window location protocol      https      443     80           if  window location port     defaultPort                return       window location port            else               return                         Usage   alert WebsocketUtils websocketUrlByPath   websocket

User · Answer

Here is my version which adds the tcp port in case it s not 80 or 443   function url s        var l   window location      return   l protocol      https       wss        ws        l hostname      l port    80   amp  amp   l port    443           l port         l pathname   s      Edit 1  Improved version as by suggestion of  kanaka    function url s        var l   window location      return   l protocol      https       wss        ws        l host   l pathname   s      Edit 2  Nowadays I create the WebSocket this   var s   new WebSocket   window location protocol      https       wss        ws        window location host     ws

[websocket] How to construct a WebSocket URI relative to the page URI?

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