anuraj/Startup.cs

## index.html
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <title>Bootstrap 101 Template</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script>
        var webSocket;
        $().ready(function () {
            webSocket = new WebSocket("ws://localhost:5000");
            webSocket.onopen = function () {
                $("#spanStatus").text("connected");
            };
            webSocket.onmessage = function (evt) {
                $("#spanStatus").text(evt.data);
            };
            webSocket.onerror = function (evt) {
                alert(evt.message);
            };
            webSocket.onclose = function () {
                $("#spanStatus").text("disconnected");
            };
            $("#btnSend").click(function () {
                if (webSocket.readyState == WebSocket.OPEN) {
                    webSocket.send($("#textInput").val());
                }
                else {
                    $("#spanStatus").text("Connection is closed");
                }
            });
        });
    </script>
</head>

<body>
<label>Enter Message</label><input type="text" id="textInput" /><button id="btnSend">Send</button>
<span id="spanStatus"></span>
</body>

</html>

## Startup.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using WebApp2.Middlewares;

namespace WebApp2
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            app.UseStaticFiles();
            app.UseWebSockets();
            app.UseWebSocketHandler();
            app.Run(async (context) =>
            {
                await context.Response.WriteAsync("Hello World!");
            });
        }
    }
}

## WebSocketMiddleware.cs
using System;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;

namespace WebApp2.Middlewares
{
    public class WebSocketMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly ILogger _logger;

        public WebSocketMiddleware(RequestDelegate next, ILoggerFactory loggerFactory)
        {
            _next = next;
            _logger = loggerFactory.CreateLogger<WebSocketMiddleware>();
        }

        public async Task Invoke(HttpContext httpContext)
        {
            _logger.LogInformation("Handling request: " + httpContext.Request.Path);

            if (httpContext.WebSockets.IsWebSocketRequest)
            {
                var webSocket = await httpContext.WebSockets.AcceptWebSocketAsync();
                while (webSocket.State == WebSocketState.Open)
                {
                    var token = CancellationToken.None;
                    var buffer = new ArraySegment<Byte>(new Byte[4096]);
                    var received = await webSocket.ReceiveAsync(buffer, token);

                    switch (received.MessageType)
                    {
                        case WebSocketMessageType.Text:
                            var request = Encoding.UTF8.GetString(buffer.Array,
                                                    buffer.Offset,
                                                    buffer.Count);
                            var type = WebSocketMessageType.Text;
                            var data = Encoding.UTF8.GetBytes("Echo from server :" + request);
                            buffer = new ArraySegment<Byte>(data);
                            await webSocket.SendAsync(buffer, type, true, token);
                            break;
                    }
                }
            }
            else
            {
                await _next.Invoke(httpContext);
            }

            _logger.LogInformation("Finished handling request.");
        }
    }

    public static class RequestLoggerExtensions
    {
        public static IApplicationBuilder UseWebSocketHandler(this IApplicationBuilder builder)
        {
            return builder.UseMiddleware<WebSocketMiddleware>();
        }
    }
}
	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<!-- The above 3 meta tags must come first in the head; any other head content must come after these tags -->
	<title>Bootstrap 101 Template</title>
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
	<script>
	var webSocket;
	$().ready(function () {
	webSocket = new WebSocket("ws://localhost:5000");
	webSocket.onopen = function () {
	$("#spanStatus").text("connected");
	};
	webSocket.onmessage = function (evt) {
	$("#spanStatus").text(evt.data);
	};
	webSocket.onerror = function (evt) {
	alert(evt.message);
	};
	webSocket.onclose = function () {
	$("#spanStatus").text("disconnected");
	};
	$("#btnSend").click(function () {
	if (webSocket.readyState == WebSocket.OPEN) {
	webSocket.send($("#textInput").val());
	}
	else {
	$("#spanStatus").text("Connection is closed");
	}
	});
	});
	</script>
	</head>

	<body>
	<label>Enter Message</label><input type="text" id="textInput" /><button id="btnSend">Send</button>
	<span id="spanStatus"></span>
	</body>

	</html>
	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Threading.Tasks;
	using Microsoft.AspNetCore.Builder;
	using Microsoft.AspNetCore.Hosting;
	using Microsoft.AspNetCore.Http;
	using Microsoft.Extensions.DependencyInjection;
	using Microsoft.Extensions.Logging;
	using WebApp2.Middlewares;

	namespace WebApp2
	{
	public class Startup
	{
	// This method gets called by the runtime. Use this method to add services to the container.
	// For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
	public void ConfigureServices(IServiceCollection services)
	{
	}

	// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
	public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
	{
	loggerFactory.AddConsole();

	if (env.IsDevelopment())
	{
	app.UseDeveloperExceptionPage();
	}
	app.UseStaticFiles();
	app.UseWebSockets();
	app.UseWebSocketHandler();
	app.Run(async (context) =>
	{
	await context.Response.WriteAsync("Hello World!");
	});
	}
	}
	}
	using System;
	using System.Net.WebSockets;
	using System.Text;
	using System.Threading;
	using System.Threading.Tasks;
	using Microsoft.AspNetCore.Builder;
	using Microsoft.AspNetCore.Http;
	using Microsoft.Extensions.Logging;

	namespace WebApp2.Middlewares
	{
	public class WebSocketMiddleware
	{
	private readonly RequestDelegate _next;
	private readonly ILogger _logger;

	public WebSocketMiddleware(RequestDelegate next, ILoggerFactory loggerFactory)
	{
	_next = next;
	_logger = loggerFactory.CreateLogger<WebSocketMiddleware>();
	}

	public async Task Invoke(HttpContext httpContext)
	{
	_logger.LogInformation("Handling request: " + httpContext.Request.Path);

	if (httpContext.WebSockets.IsWebSocketRequest)
	{
	var webSocket = await httpContext.WebSockets.AcceptWebSocketAsync();
	while (webSocket.State == WebSocketState.Open)
	{
	var token = CancellationToken.None;
	var buffer = new ArraySegment<Byte>(new Byte[4096]);
	var received = await webSocket.ReceiveAsync(buffer, token);

	switch (received.MessageType)
	{
	case WebSocketMessageType.Text:
	var request = Encoding.UTF8.GetString(buffer.Array,
	buffer.Offset,
	buffer.Count);
	var type = WebSocketMessageType.Text;
	var data = Encoding.UTF8.GetBytes("Echo from server :" + request);
	buffer = new ArraySegment<Byte>(data);
	await webSocket.SendAsync(buffer, type, true, token);
	break;
	}
	}
	}
	else
	{
	await _next.Invoke(httpContext);
	}

	_logger.LogInformation("Finished handling request.");
	}
	}

	public static class RequestLoggerExtensions
	{
	public static IApplicationBuilder UseWebSocketHandler(this IApplicationBuilder builder)
	{
	return builder.UseMiddleware<WebSocketMiddleware>();
	}
	}
	}