From 25c240bef5a376aa4c912f44dbf2b42e30278290 Mon Sep 17 00:00:00 2001
From: Javier Calvarro Nelson <jacalvar@microsoft.com>
Date: Wed, 7 Aug 2019 17:40:02 +0200
Subject: [PATCH] [Blazor] Graceful disconnection

* Adds a new API endpoint to trigger graceful disconnection from blazor clients.
* Uses the sendBeacon API on the Blazor client to trigger graceful disconnections on the client when the document gets unloaded, which happens when closing the window, navigating away from the page or refreshing the page.
---
 .../ComponentEndpointConventionBuilder.cs     |  11 +-
 ...ComponentEndpointRouteBuilderExtensions.cs |  12 +-
 .../Server/src/CircuitDisconnectMiddleware.cs | 103 ++++++++
 .../Server/src/Circuits/CircuitRegistry.cs    |  32 ++-
 src/Components/Server/src/ComponentHub.cs     |  29 +--
 .../test/CircuitDisconnectMiddlewareTest.cs   | 244 ++++++++++++++++++
 ...onentEndpointRouteBuilderExtensionsTest.cs |   2 +
 .../Web.JS/dist/Release/blazor.server.js      |   4 +-
 src/Components/Web.JS/src/Boot.Server.ts      |  10 +
 .../CircuitGracefulTerminationTests.cs        |   3 +-
 10 files changed, 404 insertions(+), 46 deletions(-)
 create mode 100644 src/Components/Server/src/CircuitDisconnectMiddleware.cs
 create mode 100644 src/Components/Server/test/CircuitDisconnectMiddlewareTest.cs

diff --git a/src/Components/Server/src/Builder/ComponentEndpointConventionBuilder.cs b/src/Components/Server/src/Builder/ComponentEndpointConventionBuilder.cs
index 021272c7d6..a154feb4e6 100644
--- a/src/Components/Server/src/Builder/ComponentEndpointConventionBuilder.cs
+++ b/src/Components/Server/src/Builder/ComponentEndpointConventionBuilder.cs
@@ -10,11 +10,13 @@ namespace Microsoft.AspNetCore.Builder
     /// </summary>
     public sealed class ComponentEndpointConventionBuilder : IHubEndpointConventionBuilder
     {
-        private readonly IEndpointConventionBuilder _endpointConventionBuilder;
+        private readonly IEndpointConventionBuilder _hubEndpoint;
+        private readonly IEndpointConventionBuilder _disconnectEndpoint;
 
-        internal ComponentEndpointConventionBuilder(IEndpointConventionBuilder endpointConventionBuilder)
+        internal ComponentEndpointConventionBuilder(IEndpointConventionBuilder hubEndpoint, IEndpointConventionBuilder disconnectEndpoint)
         {
-            _endpointConventionBuilder = endpointConventionBuilder;
+            _hubEndpoint = hubEndpoint;
+            _disconnectEndpoint = disconnectEndpoint;
         }
 
         /// <summary>
@@ -23,7 +25,8 @@ namespace Microsoft.AspNetCore.Builder
         /// <param name="convention">The convention to add to the builder.</param>
         public void Add(Action<EndpointBuilder> convention)
         {
-            _endpointConventionBuilder.Add(convention);
+            _hubEndpoint.Add(convention);
+            _disconnectEndpoint.Add(convention);
         }
     }
 }
diff --git a/src/Components/Server/src/Builder/ComponentEndpointRouteBuilderExtensions.cs b/src/Components/Server/src/Builder/ComponentEndpointRouteBuilderExtensions.cs
index 8af4ad37e8..d747a69b60 100644
--- a/src/Components/Server/src/Builder/ComponentEndpointRouteBuilderExtensions.cs
+++ b/src/Components/Server/src/Builder/ComponentEndpointRouteBuilderExtensions.cs
@@ -292,7 +292,17 @@ namespace Microsoft.AspNetCore.Builder
                 throw new ArgumentNullException(nameof(configureOptions));
             }
 
-            return new ComponentEndpointConventionBuilder(endpoints.MapHub<ComponentHub>(path, configureOptions)).AddComponent(componentType, selector);
+            var hubEndpoint = endpoints.MapHub<ComponentHub>(path, configureOptions);
+
+            var disconnectEndpoint = endpoints.Map(
+                (path.EndsWith("/") ? path : path + "/") + "disconnect/",
+                endpoints.CreateApplicationBuilder().UseMiddleware<CircuitDisconnectMiddleware>().Build())
+                .WithDisplayName("Blazor disconnect");
+
+            return new ComponentEndpointConventionBuilder(
+                hubEndpoint,
+                disconnectEndpoint)
+                    .AddComponent(componentType, selector);
         }
     }
 }
diff --git a/src/Components/Server/src/CircuitDisconnectMiddleware.cs b/src/Components/Server/src/CircuitDisconnectMiddleware.cs
new file mode 100644
index 0000000000..ecacf511d7
--- /dev/null
+++ b/src/Components/Server/src/CircuitDisconnectMiddleware.cs
@@ -0,0 +1,103 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Components.Server.Circuits;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Logging;
+
+namespace Microsoft.AspNetCore.Components.Server
+{
+    // We use a middlware so that we can use DI.
+    internal class CircuitDisconnectMiddleware
+    {
+        private const string CircuitIdKey = "circuitId";
+
+        public CircuitDisconnectMiddleware(
+            ILogger<CircuitDisconnectMiddleware> logger,
+            CircuitRegistry registry,
+            CircuitIdFactory circuitIdFactory,
+            RequestDelegate next)
+        {
+            Logger = logger;
+            Registry = registry;
+            CircuitIdFactory = circuitIdFactory;
+            Next = next;
+        }
+
+        public ILogger<CircuitDisconnectMiddleware> Logger { get; }
+        public CircuitRegistry Registry { get; }
+        public CircuitIdFactory CircuitIdFactory { get; }
+        public RequestDelegate Next { get; }
+
+        public async Task Invoke(HttpContext context)
+        {
+            if (!HttpMethods.IsPost(context.Request.Method))
+            {
+                context.Response.StatusCode = StatusCodes.Status405MethodNotAllowed;
+                return;
+            }
+
+            var (hasCircuitId, circuitId) = await TryGetCircuitIdAsync(context);
+            if (!hasCircuitId)
+            {
+                context.Response.StatusCode = StatusCodes.Status400BadRequest;
+                return;
+            }
+
+            await TerminateCircuitGracefully(circuitId);
+
+            context.Response.StatusCode = StatusCodes.Status200OK;
+        }
+
+        private async Task<(bool, string)> TryGetCircuitIdAsync(HttpContext context)
+        {
+            try
+            {
+                if (!context.Request.HasFormContentType)
+                {
+                    return (false, null);
+                }
+
+                var form = await context.Request.ReadFormAsync();
+                if (!form.TryGetValue(CircuitIdKey, out var circuitId) || !CircuitIdFactory.ValidateCircuitId(circuitId))
+                {
+                    return (false, null);
+                }
+
+                return (true, circuitId);
+            }
+            catch
+            {
+                return (false, null);
+            }
+        }
+
+        private async Task TerminateCircuitGracefully(string circuitId)
+        {
+            try
+            {
+                await Registry.Terminate(circuitId);
+                Log.CircuitTerminatedGracefully(Logger, circuitId);
+            }
+            catch (Exception e)
+            {
+                Log.UnhandledExceptionInCircuit(Logger, circuitId, e);
+            }
+        }
+
+        private class Log
+        {
+            private static readonly Action<ILogger, string, Exception> _circuitTerminatedGracefully =
+                LoggerMessage.Define<string>(LogLevel.Debug, new EventId(1, "CircuitTerminatedGracefully"), "Circuit '{CircuitId}' terminated gracefully");
+
+            private static readonly Action<ILogger, string, Exception> _unhandledExceptionInCircuit =
+                LoggerMessage.Define<string>(LogLevel.Warning, new EventId(2, "UnhandledExceptionInCircuit"), "Unhandled exception in circuit {CircuitId} while terminating gracefully.");
+
+            public static void CircuitTerminatedGracefully(ILogger logger, string circuitId) => _circuitTerminatedGracefully(logger, circuitId, null);
+
+            public static void UnhandledExceptionInCircuit(ILogger logger, string circuitId, Exception exception) => _unhandledExceptionInCircuit(logger, circuitId, exception);
+        }
+    }
+}
diff --git a/src/Components/Server/src/Circuits/CircuitRegistry.cs b/src/Components/Server/src/Circuits/CircuitRegistry.cs
index 9fe25c5b68..a5c970c4af 100644
--- a/src/Components/Server/src/Circuits/CircuitRegistry.cs
+++ b/src/Components/Server/src/Circuits/CircuitRegistry.cs
@@ -81,15 +81,6 @@ namespace Microsoft.AspNetCore.Components.Server.Circuits
             }
         }
 
-        public void PermanentDisconnect(CircuitHost circuitHost)
-        {
-            if (ConnectedCircuits.TryRemove(circuitHost.CircuitId, out _))
-            {
-                Log.CircuitDisconnectedPermanently(_logger, circuitHost.CircuitId);
-                circuitHost.Client.SetDisconnected();
-            }
-        }
-
         public virtual Task DisconnectAsync(CircuitHost circuitHost, string connectionId)
         {
             Log.CircuitDisconnectStarted(_logger, circuitHost.CircuitId, connectionId);
@@ -297,6 +288,29 @@ namespace Microsoft.AspNetCore.Components.Server.Circuits
             }
         }
 
+        public ValueTask Terminate(string circuitId)
+        {
+            CircuitHost circuitHost;
+            DisconnectedCircuitEntry entry = default;
+            lock (CircuitRegistryLock)
+            {
+                if (ConnectedCircuits.TryGetValue(circuitId, out circuitHost) || DisconnectedCircuits.TryGetValue(circuitId, out entry))
+                {
+                    circuitHost ??= entry.CircuitHost;
+                    DisconnectedCircuits.Remove(circuitHost.CircuitId);
+                    ConnectedCircuits.TryRemove(circuitHost.CircuitId, out _);
+                    Log.CircuitDisconnectedPermanently(_logger, circuitHost.CircuitId);
+                    circuitHost.Client.SetDisconnected();
+                }
+                else
+                {
+                    return default;
+                }
+            }
+
+            return circuitHost?.DisposeAsync() ?? default;
+        }
+
         private readonly struct DisconnectedCircuitEntry
         {
             public DisconnectedCircuitEntry(CircuitHost circuitHost, CancellationTokenSource tokenSource)
diff --git a/src/Components/Server/src/ComponentHub.cs b/src/Components/Server/src/ComponentHub.cs
index b559e590c3..f83fb5e210 100644
--- a/src/Components/Server/src/ComponentHub.cs
+++ b/src/Components/Server/src/ComponentHub.cs
@@ -68,34 +68,7 @@ namespace Microsoft.AspNetCore.Components.Server
                 return Task.CompletedTask;
             }
 
-            if (exception != null)
-            {
-                return _circuitRegistry.DisconnectAsync(circuitHost, Context.ConnectionId);
-            }
-            else
-            {
-                // The client will gracefully disconnect when using websockets by correctly closing the TCP connection.
-                // This happens when the user closes a tab, navigates away from the page or reloads the page.
-                // In these situations we know the user is done with the circuit, so we can get rid of it at that point.
-                // This is important to be able to more efficiently manage resources, specially memory.
-                return TerminateCircuitGracefully(circuitHost);
-            }
-        }
-
-        private async Task TerminateCircuitGracefully(CircuitHost circuitHost)
-        {
-            try
-            {
-                Log.CircuitTerminatedGracefully(_logger, circuitHost.CircuitId);
-                _circuitRegistry.PermanentDisconnect(circuitHost);
-                await circuitHost.DisposeAsync();
-            }
-            catch (Exception e)
-            {
-                Log.UnhandledExceptionInCircuit(_logger, circuitHost.CircuitId, e);
-            }
-
-            await _circuitRegistry.DisconnectAsync(circuitHost, Context.ConnectionId);
+            return _circuitRegistry.DisconnectAsync(circuitHost, Context.ConnectionId);
         }
 
         /// <summary>
diff --git a/src/Components/Server/test/CircuitDisconnectMiddlewareTest.cs b/src/Components/Server/test/CircuitDisconnectMiddlewareTest.cs
new file mode 100644
index 0000000000..627c51b576
--- /dev/null
+++ b/src/Components/Server/test/CircuitDisconnectMiddlewareTest.cs
@@ -0,0 +1,244 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using System.IO;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Components.Server.Circuits;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Logging.Abstractions;
+using Microsoft.Extensions.Options;
+using Xunit;
+
+namespace Microsoft.AspNetCore.Components.Server
+{
+    public class CircuitDisconnectMiddlewareTest
+    {
+        [Theory]
+        [InlineData("GET")]
+        [InlineData("PUT")]
+        [InlineData("DELETE")]
+        [InlineData("HEAD")]
+        public async Task DisconnectMiddleware_OnlyAccepts_PostRequests(string httpMethod)
+        {
+            // Arrange
+            var circuitIdFactory = TestCircuitIdFactory.CreateTestFactory();
+            var registry = new CircuitRegistry(
+                Options.Create(new CircuitOptions()),
+                NullLogger<CircuitRegistry>.Instance,
+                circuitIdFactory);
+
+            var middleware = new CircuitDisconnectMiddleware(
+                NullLogger<CircuitDisconnectMiddleware>.Instance,
+                registry,
+                circuitIdFactory,
+                (ctx) => Task.CompletedTask);
+
+            var context = new DefaultHttpContext();
+            context.Request.Method = httpMethod;
+
+            // Act
+            await middleware.Invoke(context);
+
+            // Assert
+            Assert.Equal(StatusCodes.Status405MethodNotAllowed, context.Response.StatusCode);
+        }
+
+        [Theory]
+        [InlineData(null)]
+        [InlineData("application/json")]
+        public async Task Returns400BadRequest_ForInvalidContentTypes(string contentType)
+        {
+            // Arrange
+            var circuitIdFactory = TestCircuitIdFactory.CreateTestFactory();
+            var registry = new CircuitRegistry(
+                Options.Create(new CircuitOptions()),
+                NullLogger<CircuitRegistry>.Instance,
+                circuitIdFactory);
+
+            var middleware = new CircuitDisconnectMiddleware(
+                NullLogger<CircuitDisconnectMiddleware>.Instance,
+                registry,
+                circuitIdFactory,
+                (ctx) => Task.CompletedTask);
+
+            var context = new DefaultHttpContext();
+            context.Request.Method = HttpMethods.Post;
+            context.Request.ContentType = contentType;
+
+            // Act
+            await middleware.Invoke(context);
+
+            // Assert
+            Assert.Equal(StatusCodes.Status400BadRequest, context.Response.StatusCode);
+        }
+
+        [Fact]
+        public async Task Returns400BadRequest_IfNoCircuitIdOnForm()
+        {
+            // Arrange
+            var circuitIdFactory = TestCircuitIdFactory.CreateTestFactory();
+            var registry = new CircuitRegistry(
+                Options.Create(new CircuitOptions()),
+                NullLogger<CircuitRegistry>.Instance,
+                circuitIdFactory);
+
+            var middleware = new CircuitDisconnectMiddleware(
+                NullLogger<CircuitDisconnectMiddleware>.Instance,
+                registry,
+                circuitIdFactory,
+                (ctx) => Task.CompletedTask);
+
+            var context = new DefaultHttpContext();
+            context.Request.Method = HttpMethods.Post;
+            context.Request.ContentType = "application/x-www-form-urlencoded";
+
+            // Act
+            await middleware.Invoke(context);
+
+            // Assert
+            Assert.Equal(StatusCodes.Status400BadRequest, context.Response.StatusCode);
+        }
+
+        [Fact]
+        public async Task Returns400BadRequest_InvalidCircuitId()
+        {
+            // Arrange
+            var circuitIdFactory = TestCircuitIdFactory.CreateTestFactory();
+            var registry = new CircuitRegistry(
+                Options.Create(new CircuitOptions()),
+                NullLogger<CircuitRegistry>.Instance,
+                circuitIdFactory);
+
+            var middleware = new CircuitDisconnectMiddleware(
+                NullLogger<CircuitDisconnectMiddleware>.Instance,
+                registry,
+                circuitIdFactory,
+                (ctx) => Task.CompletedTask);
+
+            using var memory = new MemoryStream();
+            await new FormUrlEncodedContent(new Dictionary<string, string> { ["circuitId"] = "1234" }).CopyToAsync(memory);
+            memory.Seek(0, SeekOrigin.Begin);
+
+            var context = new DefaultHttpContext();
+            context.Request.Method = HttpMethods.Post;
+            context.Request.ContentType = "application/x-www-form-urlencoded";
+            context.Request.Body = memory;
+
+            // Act
+            await middleware.Invoke(context);
+
+            // Assert
+            Assert.Equal(StatusCodes.Status400BadRequest, context.Response.StatusCode);
+        }
+
+        [Fact]
+        public async Task Returns200OK_NonExistingCircuit()
+        {
+            // Arrange
+            var circuitIdFactory = TestCircuitIdFactory.CreateTestFactory();
+            var id = circuitIdFactory.CreateCircuitId();
+            var registry = new CircuitRegistry(
+                Options.Create(new CircuitOptions()),
+                NullLogger<CircuitRegistry>.Instance,
+                circuitIdFactory);
+
+            var middleware = new CircuitDisconnectMiddleware(
+                NullLogger<CircuitDisconnectMiddleware>.Instance,
+                registry,
+                circuitIdFactory,
+                (ctx) => Task.CompletedTask);
+
+            using var memory = new MemoryStream();
+            await new FormUrlEncodedContent(new Dictionary<string, string> { ["circuitId"] = id }).CopyToAsync(memory);
+            memory.Seek(0, SeekOrigin.Begin);
+
+            var context = new DefaultHttpContext();
+            context.Request.Method = HttpMethods.Post;
+            context.Request.ContentType = "application/x-www-form-urlencoded";
+            context.Request.Body = memory;
+
+            // Act
+            await middleware.Invoke(context);
+
+            // Assert
+            Assert.Equal(StatusCodes.Status200OK, context.Response.StatusCode);
+        }
+
+        [Fact]
+        public async Task GracefullyTerminates_ConnectedCircuit()
+        {
+            // Arrange
+            var circuitIdFactory = TestCircuitIdFactory.CreateTestFactory();
+            var id = circuitIdFactory.CreateCircuitId();
+            var testCircuitHost = TestCircuitHost.Create(id);
+
+            var registry = new CircuitRegistry(
+                Options.Create(new CircuitOptions()),
+                NullLogger<CircuitRegistry>.Instance,
+                circuitIdFactory);
+
+            registry.Register(testCircuitHost);
+
+            var middleware = new CircuitDisconnectMiddleware(
+                NullLogger<CircuitDisconnectMiddleware>.Instance,
+                registry,
+                circuitIdFactory,
+                (ctx) => Task.CompletedTask);
+
+            using var memory = new MemoryStream();
+            await new FormUrlEncodedContent(new Dictionary<string, string> { ["circuitId"] = id }).CopyToAsync(memory);
+            memory.Seek(0, SeekOrigin.Begin);
+
+            var context = new DefaultHttpContext();
+            context.Request.Method = HttpMethods.Post;
+            context.Request.ContentType = "application/x-www-form-urlencoded";
+            context.Request.Body = memory;
+
+            // Act
+            await middleware.Invoke(context);
+
+            // Assert
+            Assert.Equal(StatusCodes.Status200OK, context.Response.StatusCode);
+        }
+
+        [Fact]
+        public async Task GracefullyTerminates_DisconnectedCircuit()
+        {
+            // Arrange
+            var circuitIdFactory = TestCircuitIdFactory.CreateTestFactory();
+            var id = circuitIdFactory.CreateCircuitId();
+            var circuitHost = TestCircuitHost.Create(id);
+
+            var registry = new CircuitRegistry(
+                Options.Create(new CircuitOptions()),
+                NullLogger<CircuitRegistry>.Instance,
+                circuitIdFactory);
+
+            registry.Register(circuitHost);
+            await registry.DisconnectAsync(circuitHost, "1234");
+
+            var middleware = new CircuitDisconnectMiddleware(
+                NullLogger<CircuitDisconnectMiddleware>.Instance,
+                registry,
+                circuitIdFactory,
+                (ctx) => Task.CompletedTask);
+
+            using var memory = new MemoryStream();
+            await new FormUrlEncodedContent(new Dictionary<string, string> { ["circuitId"] = id }).CopyToAsync(memory);
+            memory.Seek(0, SeekOrigin.Begin);
+
+            var context = new DefaultHttpContext();
+            context.Request.Method = HttpMethods.Post;
+            context.Request.ContentType = "application/x-www-form-urlencoded";
+            context.Request.Body = memory;
+
+            // Act
+            await middleware.Invoke(context);
+
+            // Assert
+            Assert.Equal(StatusCodes.Status200OK, context.Response.StatusCode);
+        }
+    }
+}
diff --git a/src/Components/Server/test/ComponentEndpointRouteBuilderExtensionsTest.cs b/src/Components/Server/test/ComponentEndpointRouteBuilderExtensionsTest.cs
index cba13e8581..852ad62f0d 100644
--- a/src/Components/Server/test/ComponentEndpointRouteBuilderExtensionsTest.cs
+++ b/src/Components/Server/test/ComponentEndpointRouteBuilderExtensionsTest.cs
@@ -4,6 +4,7 @@
 using System.Diagnostics;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using Moq;
@@ -63,6 +64,7 @@ namespace Microsoft.AspNetCore.Components.Server.Tests
             services.AddRouting();
             services.AddSignalR();
             services.AddServerSideBlazor();
+            services.AddSingleton<IConfiguration>(new ConfigurationBuilder().Build());
 
             var serviceProvder = services.BuildServiceProvider();
 
diff --git a/src/Components/Web.JS/dist/Release/blazor.server.js b/src/Components/Web.JS/dist/Release/blazor.server.js
index a79de53cec..fc7be4706b 100644
--- a/src/Components/Web.JS/dist/Release/blazor.server.js
+++ b/src/Components/Web.JS/dist/Release/blazor.server.js
@@ -1,11 +1,11 @@
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this.resetKeepAliveInterval(),this.connection.send(e)},e.prototype.sendWithProtocol=function(e){return this.sendMessage(this.protocol.writeMessage(e))},e.prototype.send=function(e){for(var t=[],n=1;n<arguments.length;n++)t[n-1]=arguments[n];var r=this.replaceStreamingParams(t),o=r[0],i=r[1],s=this.sendWithProtocol(this.createInvocation(e,t,!0,i));return this.launchStreams(o,s),s},e.prototype.invoke=function(e){for(var t=this,n=[],r=1;r<arguments.length;r++)n[r-1]=arguments[r];var i=this.replaceStreamingParams(n),s=i[0],a=i[1],c=this.createInvocation(e,n,!1,a);return new Promise(function(e,n){t.callbacks[c.invocationId]=function(t,r){r?n(r):t&&(t.type===o.Completion?t.error?n(new Error(t.error)):e(t.result):n(new Error("Unexpected message type: "+t.type)))};var r=t.sendWithProtocol(c).catch(function(e){n(e),delete t.callbacks[c.invocationId]});t.launchStreams(s,r)})},e.prototype.on=function(e,t){e&&t&&(e=e.toLowerCase(),this.methods[e]||(this.methods[e]=[]),-1===this.methods[e].indexOf(t)&&this.methods[e].push(t))},e.prototype.off=function(e,t){if(e){e=e.toLowerCase();var n=this.methods[e];if(n)if(t){var r=n.indexOf(t);-1!==r&&(n.splice(r,1),0===n.length&&delete this.methods[e])}else delete this.methods[e]}},e.prototype.onclose=function(e){e&&this.closedCallbacks.push(e)},e.prototype.onreconnecting=function(e){e&&this.reconnectingCallbacks.push(e)},e.prototype.onreconnected=function(e){e&&this.reconnectedCallbacks.push(e)},e.prototype.processIncomingData=function(e){if(this.cleanupTimeout(),this.receivedHandshakeResponse||(e=this.processHandshakeResponse(e),this.receivedHandshakeResponse=!0),e)for(var t=0,n=this.protocol.parseMessages(e,this.logger);t<n.length;t++){var r=n[t];switch(r.type){case o.Invocation:this.invokeClientMethod(r);break;case o.StreamItem:case o.Completion:var i=this.callbacks[r.invocationId];i&&(r.type===o.Completion&&delete this.callbacks[r.invocationId],i(r));break;case o.Ping:break;case o.Close:this.logger.log(c.a.Information,"Close message received from server."),this.stopPromise=this.stopInternal(r.error?new Error("Server returned an error on close: "+r.error):void 0);break;default:this.logger.log(c.a.Warning,"Invalid message type: "+r.type+".")}}this.resetTimeoutPeriod()},e.prototype.processHandshakeResponse=function(e){var t,n,r;try{r=(t=this.handshakeProtocol.parseHandshakeResponse(e))[0],n=t[1]}catch(e){var o="Error parsing handshake response: "+e;this.logger.log(c.a.Error,o);var i=new Error(o);throw this.handshakeRejecter(i),i}if(n.error){o="Server returned handshake error: "+n.error;this.logger.log(c.a.Error,o);i=new Error(o);throw this.handshakeRejecter(i),i}return this.logger.log(c.a.Debug,"Server handshake complete."),this.handshakeResolver(),r},e.prototype.resetKeepAliveInterval=function(){var e=this;this.cleanupPingTimer(),this.pingServerHandle=setTimeout(function(){return v(e,void 0,void 0,function(){return b(this,function(e){switch(e.label){case 0:if(this.connectionState!==d.Connected)return[3,4];e.label=1;case 1:return e.trys.push([1,3,,4]),[4,this.sendMessage(this.cachedPingMessage)];case 2:return e.sent(),[3,4];case 3:return e.sent(),this.cleanupPingTimer(),[3,4];case 4:return[2]}})})},this.keepAliveIntervalInMilliseconds)},e.prototype.resetTimeoutPeriod=function(){var e=this;this.connection.features&&this.connection.features.inherentKeepAlive||(this.timeoutHandle=setTimeout(function(){return e.serverTimeout()},this.serverTimeoutInMilliseconds))},e.prototype.serverTimeout=function(){this.connection.stop(new Error("Server timeout elapsed without receiving a message from the server."))},e.prototype.invokeClientMethod=function(e){var t=this,n=this.methods[e.target.toLowerCase()];if(n){try{n.forEach(function(n){return n.apply(t,e.arguments)})}catch(t){this.logger.log(c.a.Error,"A callback for the method "+e.target.toLowerCase()+" threw error '"+t+"'.")}if(e.invocationId){var r="Server requested a response, which is not supported in this version of the client.";this.logger.log(c.a.Error,r),this.stopPromise=this.stopInternal(new Error(r))}}else this.logger.log(c.a.Warning,"No client method with the name '"+e.target+"' found.")},e.prototype.connectionClosed=function(e){this.logger.log(c.a.Debug,"HubConnection.connectionClosed("+e+") called while in state "+this.connectionState+"."),this.stopDuringStartError=this.stopDuringStartError||e||new Error("The underlying connection was closed before the hub handshake could complete."),this.handshakeResolver&&this.handshakeResolver(),this.cancelCallbacksWithError(e||new Error("Invocation canceled due to the underlying connection being 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a.trys.push([3,5,,6]),r=e+"&_="+Date.now(),this.logger.log(c.a.Trace,"(LongPolling transport) polling: "+r+"."),[4,this.httpClient.get(r,t)];case 4:return 204===(o=a.sent()).statusCode?(this.logger.log(c.a.Information,"(LongPolling transport) Poll terminated by server."),this.running=!1):200!==o.statusCode?(this.logger.log(c.a.Error,"(LongPolling transport) Unexpected response code: "+o.statusCode+"."),this.closeError=new i.b(o.statusText||"",o.statusCode),this.running=!1):o.content?(this.logger.log(c.a.Trace,"(LongPolling transport) data received. 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t,n,r,o,i,s;return j(this,function(a){switch(a.label){case 0:t=this.baseUrl,this.accessTokenFactory=this.options.accessTokenFactory,a.label=1;case 1:return a.trys.push([1,12,,13]),this.options.skipNegotiation?this.options.transport!==E.WebSockets?[3,3]:(this.transport=this.constructTransport(E.WebSockets),[4,this.startTransport(t,e)]):[3,5];case 2:return a.sent(),[3,4];case 3:throw new Error("Negotiation can only be skipped when using the WebSocket transport directly.");case 4:return[3,11];case 5:n=null,r=0,o=function(){var e;return j(this,function(o){switch(o.label){case 0:return[4,i.getNegotiationResponse(t)];case 1:if(n=o.sent(),"Disconnecting"===i.connectionState||"Disconnected"===i.connectionState)throw new Error("The connection was stopped during negotiation.");if(n.error)throw new Error(n.error);if(n.ProtocolVersion)throw new Error("Detected a connection attempt to an ASP.NET SignalR Server. 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"+i.join(" ")))]:[2,Promise.reject(new Error("None of the transports supported by the client are supported by the server."))]}})})},e.prototype.constructTransport=function(e){switch(e){case E.WebSockets:if(!this.options.WebSocket)throw new Error("'WebSocket' is not supported in your environment.");return new A(this.httpClient,this.accessTokenFactory,this.logger,this.options.logMessageContent||!1,this.options.WebSocket);case E.ServerSentEvents:if(!this.options.EventSource)throw new Error("'EventSource' is not supported in your environment.");return new O(this.httpClient,this.accessTokenFactory,this.logger,this.options.logMessageContent||!1,this.options.EventSource);case E.LongPolling:return new x(this.httpClient,this.accessTokenFactory,this.logger,this.options.logMessageContent||!1);default:throw new Error("Unknown transport: "+e+".")}},e.prototype.startTransport=function(e,t){var n=this;return this.transport.onreceive=this.onreceive,this.transport.onclose=function(e){return n.stopConnection(e)},this.transport.connect(e,t)},e.prototype.resolveTransportOrError=function(e,t,n){var r=E[e.transport];if(null==r)return this.logger.log(c.a.Debug,"Skipping transport '"+e.transport+"' because it is not supported by this client."),new Error("Skipping transport '"+e.transport+"' because it is not supported by this client.");if(!function(e,t){return!e||0!=(t&e)}(t,r))return this.logger.log(c.a.Debug,"Skipping transport '"+E[r]+"' because it was disabled by the client."),new Error("'"+E[r]+"' is disabled by the client.");if(!(e.transferFormats.map(function(e){return S[e]}).indexOf(n)>=0))return this.logger.log(c.a.Debug,"Skipping transport '"+E[r]+"' because it does not support the requested transfer format '"+S[n]+"'."),new Error("'"+E[r]+"' does not support "+S[n]+".");if(r===E.WebSockets&&!this.options.WebSocket||r===E.ServerSentEvents&&!this.options.EventSource)return this.logger.log(c.a.Debug,"Skipping transport '"+E[r]+"' because it is not supported in your 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n.apply(t,e.arguments)})}catch(t){this.logger.log(c.a.Error,"A callback for the method "+e.target.toLowerCase()+" threw error '"+t+"'.")}if(e.invocationId){var r="Server requested a response, which is not supported in this version of the client.";this.logger.log(c.a.Error,r),this.stopPromise=this.stopInternal(new Error(r))}}else this.logger.log(c.a.Warning,"No client method with the name '"+e.target+"' found.")},e.prototype.connectionClosed=function(e){this.logger.log(c.a.Debug,"HubConnection.connectionClosed("+e+") called while in state "+this.connectionState+"."),this.stopDuringStartError=this.stopDuringStartError||e||new Error("The underlying connection was closed before the hub handshake could complete."),this.handshakeResolver&&this.handshakeResolver(),this.cancelCallbacksWithError(e||new Error("Invocation canceled due to the underlying connection being 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this.invocationId++,{arguments:t,invocationId:r.toString(),streamIds:n,target:e,type:o.StreamInvocation}},e.prototype.createCancelInvocation=function(e){return{invocationId:e,type:o.CancelInvocation}},e.prototype.createStreamItemMessage=function(e,t){return{invocationId:e,item:t,type:o.StreamItem}},e.prototype.createCompletionMessage=function(e,t,n){return t?{error:t,invocationId:e,type:o.Completion}:{invocationId:e,result:n,type:o.Completion}},e}(),_=[0,2e3,1e4,3e4,null],I=function(){function e(e){this.retryDelays=void 0!==e?e.concat([null]):_}return e.prototype.nextRetryDelayInMilliseconds=function(e){return this.retryDelays[e.previousRetryCount]},e}();!function(e){e[e.None=0]="None",e[e.WebSockets=1]="WebSockets",e[e.ServerSentEvents=2]="ServerSentEvents",e[e.LongPolling=4]="LongPolling"}(E||(E={})),function(e){e[e.Text=1]="Text",e[e.Binary=2]="Binary"}(S||(S={}));var T=function(){function e(){this.isAborted=!1,this.onabort=null}return 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Object.defineProperty(e.prototype,"pollAborted",{get:function(){return this.pollAbort.aborted},enumerable:!0,configurable:!0}),e.prototype.connect=function(e,t){return k(this,void 0,void 0,function(){var n,r,o,s;return P(this,function(a){switch(a.label){case 0:if(g.a.isRequired(e,"url"),g.a.isRequired(t,"transferFormat"),g.a.isIn(t,S,"transferFormat"),this.url=e,this.logger.log(c.a.Trace,"(LongPolling transport) Connecting."),t===S.Binary&&"undefined"!=typeof XMLHttpRequest&&"string"!=typeof(new XMLHttpRequest).responseType)throw new Error("Binary protocols over XmlHttpRequest not implementing advanced features are not supported.");return n={abortSignal:this.pollAbort.signal,headers:{},timeout:1e5},t===S.Binary&&(n.responseType="arraybuffer"),[4,this.getAccessToken()];case 1:return r=a.sent(),this.updateHeaderToken(n,r),o=e+"&_="+Date.now(),this.logger.log(c.a.Trace,"(LongPolling transport) polling: "+o+"."),[4,this.httpClient.get(o,n)];case 2:return 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a.trys.push([3,5,,6]),r=e+"&_="+Date.now(),this.logger.log(c.a.Trace,"(LongPolling transport) polling: "+r+"."),[4,this.httpClient.get(r,t)];case 4:return 204===(o=a.sent()).statusCode?(this.logger.log(c.a.Information,"(LongPolling transport) Poll terminated by server."),this.running=!1):200!==o.statusCode?(this.logger.log(c.a.Error,"(LongPolling transport) Unexpected response code: "+o.statusCode+"."),this.closeError=new i.b(o.statusText||"",o.statusCode),this.running=!1):o.content?(this.logger.log(c.a.Trace,"(LongPolling transport) data received. 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State.")):(this.sendQueue||(this.sendQueue=new q(this.transport)),this.sendQueue.send(e))},e.prototype.stop=function(e){return B(this,void 0,void 0,function(){var t=this;return j(this,function(n){switch(n.label){case 0:return"Disconnected"===this.connectionState?(this.logger.log(c.a.Debug,"Call to HttpConnection.stop("+e+") ignored because the connection is already in the disconnected state."),[2,Promise.resolve()]):"Disconnecting"===this.connectionState?(this.logger.log(c.a.Debug,"Call to HttpConnection.stop("+e+") ignored because the connection is already in the disconnecting state."),[2,this.stopPromise]):(this.connectionState="Disconnecting",this.stopPromise=new Promise(function(e){t.stopPromiseResolver=e}),[4,this.stopInternal(e)]);case 1:return n.sent(),[4,this.stopPromise];case 2:return n.sent(),[2]}})})},e.prototype.stopInternal=function(e){return B(this,void 0,void 0,function(){var t,n;return j(this,function(r){switch(r.label){case 0:this.stopError=e,r.label=1;case 1:return r.trys.push([1,3,,4]),[4,this.startInternalPromise];case 2:return r.sent(),[3,4];case 3:return r.sent(),[3,4];case 4:if(!this.sendQueue)return[3,9];r.label=5;case 5:return r.trys.push([5,7,,8]),[4,this.sendQueue.stop()];case 6:return r.sent(),[3,8];case 7:return t=r.sent(),this.logger.log(c.a.Error,"TransportSendQueue.stop() threw error '"+t+"'."),[3,8];case 8:this.sendQueue=void 0,r.label=9;case 9:if(!this.transport)return[3,14];r.label=10;case 10:return r.trys.push([10,12,,13]),[4,this.transport.stop()];case 11:return r.sent(),[3,13];case 12:return n=r.sent(),this.logger.log(c.a.Error,"HttpConnection.transport.stop() threw error '"+n+"'."),this.stopConnection(),[3,13];case 13:return this.transport=void 0,[3,15];case 14:this.logger.log(c.a.Debug,"HttpConnection.transport is undefined in HttpConnection.stop() because start() failed."),this.stopConnection(),r.label=15;case 15:return[2]}})})},e.prototype.startInternal=function(e){return B(this,void 0,void 0,function(){var t,n,r,o,i,s;return j(this,function(a){switch(a.label){case 0:t=this.baseUrl,this.accessTokenFactory=this.options.accessTokenFactory,a.label=1;case 1:return a.trys.push([1,12,,13]),this.options.skipNegotiation?this.options.transport!==E.WebSockets?[3,3]:(this.transport=this.constructTransport(E.WebSockets),[4,this.startTransport(t,e)]):[3,5];case 2:return a.sent(),[3,4];case 3:throw new Error("Negotiation can only be skipped when using the WebSocket transport directly.");case 4:return[3,11];case 5:n=null,r=0,o=function(){var e;return j(this,function(o){switch(o.label){case 0:return[4,i.getNegotiationResponse(t)];case 1:if(n=o.sent(),"Disconnecting"===i.connectionState||"Disconnected"===i.connectionState)throw new Error("The connection was stopped during negotiation.");if(n.error)throw new Error(n.error);if(n.ProtocolVersion)throw new Error("Detected a connection attempt to an ASP.NET SignalR Server. This client only supports connecting to an ASP.NET Core SignalR Server. See https://aka.ms/signalr-core-differences for details.");return n.url&&(t=n.url),n.accessToken&&(e=n.accessToken,i.accessTokenFactory=function(){return e}),r++,[2]}})},i=this,a.label=6;case 6:return[5,o()];case 7:a.sent(),a.label=8;case 8:if(n.url&&r<100)return[3,6];a.label=9;case 9:if(100===r&&n.url)throw new Error("Negotiate redirection limit exceeded.");return this.connectionId=n.connectionId,[4,this.createTransport(t,this.options.transport,n,e)];case 10:a.sent(),a.label=11;case 11:return this.transport instanceof x&&(this.features.inherentKeepAlive=!0),"Connecting "===this.connectionState&&(this.logger.log(c.a.Debug,"The HttpConnection connected successfully."),this.connectionState="Connected"),[3,13];case 12:return s=a.sent(),this.logger.log(c.a.Error,"Failed to start the connection: "+s),this.connectionState="Disconnected",this.transport=void 0,[2,Promise.reject(s)];case 13:return[2]}})})},e.prototype.getNegotiationResponse=function(e){return B(this,void 0,void 0,function(){var t,n,r,o,i,s;return j(this,function(a){switch(a.label){case 0:return this.accessTokenFactory?[4,this.accessTokenFactory()]:[3,2];case 1:(r=a.sent())&&((t={}).Authorization="Bearer "+r,n=t),a.label=2;case 2:o=this.resolveNegotiateUrl(e),this.logger.log(c.a.Debug,"Sending negotiation request: "+o+"."),a.label=3;case 3:return a.trys.push([3,5,,6]),[4,this.httpClient.post(o,{content:"",headers:n})];case 4:return 200!==(i=a.sent()).statusCode?[2,Promise.reject(new Error("Unexpected status code returned from negotiate "+i.statusCode))]:[2,JSON.parse(i.content)];case 5:return s=a.sent(),this.logger.log(c.a.Error,"Failed to complete negotiation with the server: "+s),[2,Promise.reject(s)];case 6:return[2]}})})},e.prototype.createConnectUrl=function(e,t){return t?e+(-1===e.indexOf("?")?"?":"&")+"id="+t:e},e.prototype.createTransport=function(e,t,n,r){return B(this,void 0,void 0,function(){var o,i,s,a,u,l,f,h,p,d;return j(this,function(g){switch(g.label){case 0:return o=this.createConnectUrl(e,n.connectionId),this.isITransport(t)?(this.logger.log(c.a.Debug,"Connection was provided an instance of ITransport, using that directly."),this.transport=t,[4,this.startTransport(o,r)]):[3,2];case 1:return g.sent(),[2];case 2:i=[],s=n.availableTransports||[],a=0,u=s,g.label=3;case 3:return a<u.length?(l=u[a],(f=this.resolveTransportOrError(l,t,r))instanceof Error?(i.push(l.transport+" failed: "+f),[3,12]):[3,4]):[3,13];case 4:if(!this.isITransport(f))return[3,12];if(this.transport=f,n.connectionId)return[3,9];g.label=5;case 5:return g.trys.push([5,7,,8]),[4,this.getNegotiationResponse(e)];case 6:return n=g.sent(),[3,8];case 7:return h=g.sent(),[2,Promise.reject(h)];case 8:o=this.createConnectUrl(e,n.connectionId),g.label=9;case 9:return g.trys.push([9,11,,12]),[4,this.startTransport(o,r)];case 10:return g.sent(),[2];case 11:return p=g.sent(),this.logger.log(c.a.Error,"Failed to start the transport '"+l.transport+"': "+p),n.connectionId=void 0,i.push(l.transport+" failed: "+p),"Connecting "!==this.connectionState?(d="Failed to select transport before stop() was called.",this.logger.log(c.a.Debug,d),[2,Promise.reject(new Error(d))]):[3,12];case 12:return a++,[3,3];case 13:return i.length>0?[2,Promise.reject(new Error("Unable to connect to the server with any of the available transports. "+i.join(" ")))]:[2,Promise.reject(new Error("None of the transports supported by the client are supported by the server."))]}})})},e.prototype.constructTransport=function(e){switch(e){case E.WebSockets:if(!this.options.WebSocket)throw new Error("'WebSocket' is not supported in your environment.");return new A(this.httpClient,this.accessTokenFactory,this.logger,this.options.logMessageContent||!1,this.options.WebSocket);case E.ServerSentEvents:if(!this.options.EventSource)throw new Error("'EventSource' is not supported in your environment.");return new O(this.httpClient,this.accessTokenFactory,this.logger,this.options.logMessageContent||!1,this.options.EventSource);case E.LongPolling:return new x(this.httpClient,this.accessTokenFactory,this.logger,this.options.logMessageContent||!1);default:throw new Error("Unknown transport: "+e+".")}},e.prototype.startTransport=function(e,t){var n=this;return this.transport.onreceive=this.onreceive,this.transport.onclose=function(e){return n.stopConnection(e)},this.transport.connect(e,t)},e.prototype.resolveTransportOrError=function(e,t,n){var r=E[e.transport];if(null==r)return this.logger.log(c.a.Debug,"Skipping transport '"+e.transport+"' because it is not supported by this client."),new Error("Skipping transport '"+e.transport+"' because it is not supported by this client.");if(!function(e,t){return!e||0!=(t&e)}(t,r))return this.logger.log(c.a.Debug,"Skipping transport '"+E[r]+"' because it was disabled by the client."),new Error("'"+E[r]+"' is disabled by the client.");if(!(e.transferFormats.map(function(e){return S[e]}).indexOf(n)>=0))return this.logger.log(c.a.Debug,"Skipping transport '"+E[r]+"' because it does not support the requested transfer format '"+S[n]+"'."),new Error("'"+E[r]+"' does not support "+S[n]+".");if(r===E.WebSockets&&!this.options.WebSocket||r===E.ServerSentEvents&&!this.options.EventSource)return this.logger.log(c.a.Debug,"Skipping transport '"+E[r]+"' because it is not supported in your environment.'"),new Error("'"+E[r]+"' is not supported in your environment.");this.logger.log(c.a.Debug,"Selecting transport '"+E[r]+"'.");try{return this.constructTransport(r)}catch(e){return e}},e.prototype.isITransport=function(e){return e&&"object"==typeof e&&"connect"in e},e.prototype.stopConnection=function(e){if(this.logger.log(c.a.Debug,"HttpConnection.stopConnection("+e+") called while in state "+this.connectionState+"."),this.transport=void 0,e=this.stopError||e,this.stopError=void 0,"Disconnected"!==this.connectionState)if("Connecting "!==this.connectionState){if("Disconnecting"===this.connectionState&&this.stopPromiseResolver(),e?this.logger.log(c.a.Error,"Connection disconnected with error '"+e+"'."):this.logger.log(c.a.Information,"Connection disconnected."),this.connectionId=void 0,this.connectionState="Disconnected",this.onclose&&this.connectionStarted){this.connectionStarted=!1;try{this.onclose(e)}catch(t){this.logger.log(c.a.Error,"HttpConnection.onclose("+e+") threw error '"+t+"'.")}}}else this.logger.log(c.a.Warning,"Call to HttpConnection.stopConnection("+e+") was ignored because the connection hasn't yet left the in the connecting state.");else this.logger.log(c.a.Debug,"Call to HttpConnection.stopConnection("+e+") was ignored because the connection is already in the disconnected state.")},e.prototype.resolveUrl=function(e){if(0===e.lastIndexOf("https://",0)||0===e.lastIndexOf("http://",0))return e;if(!g.c.isBrowser||!window.document)throw new Error("Cannot resolve '"+e+"'.");var t=window.document.createElement("a");return t.href=e,this.logger.log(c.a.Information,"Normalizing '"+e+"' to '"+t.href+"'."),t.href},e.prototype.resolveNegotiateUrl=function(e){var t=e.indexOf("?"),n=e.substring(0,-1===t?e.length:t);return"/"!==n[n.length-1]&&(n+="/"),n+="negotiate",n+=-1===t?"":e.substring(t)},e}();var q=function(){function e(e){this.transport=e,this.buffer=[],this.executing=!0,this.sendBufferedData=new W,this.transportResult=new W,this.sendLoopPromise=this.sendLoop()}return e.prototype.send=function(e){return this.bufferData(e),this.transportResult||(this.transportResult=new W),this.transportResult.promise},e.prototype.stop=function(){return this.executing=!1,this.sendBufferedData.resolve(),this.sendLoopPromise},e.prototype.bufferData=function(e){if(this.buffer.length&&typeof this.buffer[0]!=typeof e)throw new Error("Expected data to be of type "+typeof this.buffer+" but was of type "+typeof e);this.buffer.push(e),this.sendBufferedData.resolve()},e.prototype.sendLoop=function(){return B(this,void 0,void 0,function(){var t,n,r;return j(this,function(o){switch(o.label){case 0:return[4,this.sendBufferedData.promise];case 1:if(o.sent(),!this.executing)return this.transportResult&&this.transportResult.reject("Connection stopped."),[3,6];this.sendBufferedData=new W,t=this.transportResult,this.transportResult=void 0,n="string"==typeof this.buffer[0]?this.buffer.join(""):e.concatBuffers(this.buffer),this.buffer.length=0,o.label=2;case 2:return o.trys.push([2,4,,5]),[4,this.transport.send(n)];case 3:return o.sent(),t.resolve(),[3,5];case 4:return r=o.sent(),t.reject(r),[3,5];case 5:return[3,0];case 6:return[2]}})})},e.concatBuffers=function(e){for(var t=e.map(function(e){return e.byteLength}).reduce(function(e,t){return e+t}),n=new Uint8Array(t),r=0,o=0,i=e;o<i.length;o++){var s=i[o];n.set(new Uint8Array(s),r),r+=s.byteLength}return n},e}(),W=function(){function e(){var e=this;this.promise=new Promise(function(t,n){var r;return r=[t,n],e.resolver=r[0],e.rejecter=r[1],r})}return e.prototype.resolve=function(){this.resolver()},e.prototype.reject=function(e){this.rejecter(e)},e}(),z=n(6),Y=n(7),J="json",K=function(){function e(){this.name=J,this.version=1,this.transferFormat=S.Text}return e.prototype.parseMessages=function(e,t){if("string"!=typeof e)throw new Error("Invalid input for JSON hub protocol. 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  */
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DotNet.attachDispatcher({beginInvokeDotNetFromJS:function(e,t,n,r,o){i.send("BeginInvokeDotNetFromJS",e?e.toString():null,t,n,r||0,o)},endInvokeJSFromDotNet:function(e,t,n){i.send("EndInvokeJSFromDotNet",e,t,n)}}),[2,i]}})})}function E(e,t,n){n.log(h.LogLevel.Error,t),e&&e.stop()}window.Blazor.start=m,u.shouldAutoStart()&&m()},function(e,t,n){"use strict";t.byteLength=function(e){var t=u(e),n=t[0],r=t[1];return 3*(n+r)/4-r},t.toByteArray=function(e){for(var t,n=u(e),r=n[0],s=n[1],a=new i(function(e,t,n){return 3*(t+n)/4-n}(0,r,s)),c=0,l=s>0?r-4:r,f=0;f<l;f+=4)t=o[e.charCodeAt(f)]<<18|o[e.charCodeAt(f+1)]<<12|o[e.charCodeAt(f+2)]<<6|o[e.charCodeAt(f+3)],a[c++]=t>>16&255,a[c++]=t>>8&255,a[c++]=255&t;2===s&&(t=o[e.charCodeAt(f)]<<2|o[e.charCodeAt(f+1)]>>4,a[c++]=255&t);1===s&&(t=o[e.charCodeAt(f)]<<10|o[e.charCodeAt(f+1)]<<4|o[e.charCodeAt(f+2)]>>2,a[c++]=t>>8&255,a[c++]=255&t);return a},t.fromByteArray=function(e){for(var t,n=e.length,o=n%3,i=[],s=0,a=n-o;s<a;s+=16383)i.push(l(e,s,s+16383>a?a:s+16383));1===o?(t=e[n-1],i.push(r[t>>2]+r[t<<4&63]+"==")):2===o&&(t=(e[n-2]<<8)+e[n-1],i.push(r[t>>10]+r[t>>4&63]+r[t<<2&63]+"="));return i.join("")};for(var r=[],o=[],i="undefined"!=typeof Uint8Array?Uint8Array:Array,s="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",a=0,c=s.length;a<c;++a)r[a]=s[a],o[s.charCodeAt(a)]=a;function u(e){var t=e.length;if(t%4>0)throw new Error("Invalid string. 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 /*!
  * The buffer module from node.js, for the browser.
  *
diff --git a/src/Components/Web.JS/src/Boot.Server.ts b/src/Components/Web.JS/src/Boot.Server.ts
index df96f1031f..e52113d7ac 100644
--- a/src/Components/Web.JS/src/Boot.Server.ts
+++ b/src/Components/Web.JS/src/Boot.Server.ts
@@ -47,6 +47,16 @@ async function boot(userOptions?: Partial<BlazorOptions>): Promise<void> {
     return true;
   };
 
+  window.addEventListener(
+    'unload',
+    () => {
+      const data = new FormData();
+      data.set('circuitId', circuit.circuitId);
+      navigator.sendBeacon('_blazor/disconnect', data);
+    },
+    false
+  );
+
   window['Blazor'].reconnect = reconnect;
 
   logger.log(LogLevel.Information, 'Blazor server-side application started.');
diff --git a/src/Components/test/E2ETest/ServerExecutionTests/CircuitGracefulTerminationTests.cs b/src/Components/test/E2ETest/ServerExecutionTests/CircuitGracefulTerminationTests.cs
index f383818386..188fae57d0 100644
--- a/src/Components/test/E2ETest/ServerExecutionTests/CircuitGracefulTerminationTests.cs
+++ b/src/Components/test/E2ETest/ServerExecutionTests/CircuitGracefulTerminationTests.cs
@@ -55,7 +55,7 @@ namespace Microsoft.AspNetCore.Components.E2ETest.ServerExecutionTests
         public async Task ReloadingThePage_GracefullyDisconnects_TheCurrentCircuit()
         {
             // Arrange & Act
-            _ = ((IJavaScriptExecutor)Browser).ExecuteScript("location.reload()");
+            Browser.Navigate().Refresh();
             await Task.WhenAny(Task.Delay(10000), GracefulDisconnectCompletionSource.Task);
 
             // Assert
@@ -70,7 +70,6 @@ namespace Microsoft.AspNetCore.Components.E2ETest.ServerExecutionTests
             Browser.Close();
             // Set to null so that other tests in this class can create a new browser if necessary so
             // that tests don't fail when running together.
-            Browser = null;
 
             await Task.WhenAny(Task.Delay(10000), GracefulDisconnectCompletionSource.Task);