c sharp with socket programming

i have some code in mvc which are given error WebSocket connection to 'ws://localhost/api/Chatl?userid=12' failed: Error during WebSocket handshake: Unexpected response code: 404 how could resolve it??

this is chat.html file

>
<html>
<head>
<meta charset="utf-8" />
<title>title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">script>
<script type="text/javascript">
$(document).ready(function () {
var userid = prompt('Please enter a userid:');
var uri = 'ws://' + window.location.hostname + window.location.pathname.replace('chat.htm', 'api/Chat') + '?userid=' + userid;
websocket = new WebSocket(uri);
websocket.onopen = function () {
$('#messages').prepend('<div>Connected.div>');
$('#chatform').submit(function (event) {
websocket.send($('#inputbox').val());
$('#inputbox').val('');
event.preventDefault();
});
};
websocket.onerror = function (event) {
$('#messages').prepend('<div>ERRORdiv>');
};
websocket.onmessage = function (event) {
$('#btn').click(function () {
$('#messages').prepend('<div>' + event.data + 'div>');
});
};
});
script>
head>
<body>
<form id="chatform" action="">
<input id="inputbox" />
<input type="button" id="btn" value="BroadCast" />
form>
<div id="messages" />
body>
html>

this is webapi controller file

using Microsoft.Web.WebSockets;
using System;
using System.Net;
using System.Net.Http;
using System.Web;
using System.Web.Http;
namespace socket_test
{
public class ChatController : ApiController
{
// [Route("api/WsHandler")]
[HttpGet]
public HttpResponseMessage Get(string userid)
{
HttpContext.Current.AcceptWebSocketRequest(new ChatWebSocketHandler(userid));
return Request.CreateResponse(HttpStatusCode.SwitchingProtocols);
}
class ChatWebSocketHandler : WebSocketHandler
{
private static WebSocketCollection _chatClients = new WebSocketCollection();
private string _userid;
public ChatWebSocketHandler(string userid)
{
_userid = userid;
}
public override void OnOpen()
{
_chatClients.Add(this);
}
public override void OnMessage(string message)
{
_chatClients.Broadcast(_userid + ": " + message);
}
}
}
}

1 Reply

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Vincent Maverick Durano7y ago
404 generally means that the URL that you are trying to connect to cannot be found. In this case the following URL below:
ws://localhost/api/Chatl?userid=12'
doesn't exist. You need to make sure that the URL available so you can access it. If you are accessing it outside your local machine, then you need to deploy the API in a public facing IP so your client that connects to your chat app can access it.
Also, if you are looking for an elegant websocket development in C#, then you may want to look at ASP.NET SignalR: https://docs.microsoft.com/en-us/aspnet/signalr/overview/getting-started/introduction-to-signalr