Copy EndpointFeature when using LongPolling (#8730)

src/SignalR/common/Http.Connections/src/Internal/HttpConnectionDispatcher.cs

@@ -12,6 +12,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Connections;
 using Microsoft.AspNetCore.Http.Connections.Internal.Transports;
+using Microsoft.AspNetCore.Http.Endpoints;
 using Microsoft.AspNetCore.Http.Features;
 using Microsoft.AspNetCore.Internal;
 using Microsoft.Extensions.Logging;
@@ -567,7 +568,7 @@ namespace Microsoft.AspNetCore.Http.Connections.Internal
             requestFeature.PathBase = existingRequestFeature.PathBase;
             requestFeature.QueryString = existingRequestFeature.QueryString;
             requestFeature.RawTarget = existingRequestFeature.RawTarget;
-            var requestHeaders = new Dictionary<string, StringValues>(existingRequestFeature.Headers.Count, StringComparer.Ordinal);
+            var requestHeaders = new Dictionary<string, StringValues>(existingRequestFeature.Headers.Count, StringComparer.OrdinalIgnoreCase);
             foreach (var header in existingRequestFeature.Headers)
             {
                 requestHeaders[header.Key] = header.Value;
@@ -600,6 +601,9 @@ namespace Microsoft.AspNetCore.Http.Connections.Internal
             var newHttpContext = new DefaultHttpContext(features);
             newHttpContext.TraceIdentifier = context.TraceIdentifier;
 
+            var endpointFeature = context.Features.Get<IEndpointFeature>();
+            newHttpContext.SetEndpoint(endpointFeature?.Endpoint);
+
             CloneUser(newHttpContext, context);
 
             // Making request services function property could be tricky and expensive as it would require

src/SignalR/common/Http.Connections/test/HttpConnectionDispatcherTests.cs

@@ -19,6 +19,7 @@ using Microsoft.AspNetCore.Connections;
 using Microsoft.AspNetCore.Connections.Features;
 using Microsoft.AspNetCore.Http.Connections.Internal;
 using Microsoft.AspNetCore.Http.Connections.Internal.Transports;
+using Microsoft.AspNetCore.Http.Endpoints;
 using Microsoft.AspNetCore.Http.Features;
 using Microsoft.AspNetCore.Http.Internal;
 using Microsoft.AspNetCore.SignalR.Tests;
@@ -627,6 +628,7 @@ namespace Microsoft.AspNetCore.Http.Connections.Tests
                     context.Connection.LocalPort = 4563;
                     context.Connection.RemoteIpAddress = IPAddress.IPv6Any;
                     context.Connection.RemotePort = 43456;
+                    context.SetEndpoint(new Endpoint(null, null, "TestName"));
 
                     var builder = new ConnectionBuilder(services.BuildServiceProvider());
                     builder.UseConnectionHandler<HttpContextConnectionHandler>();
@@ -679,6 +681,9 @@ namespace Microsoft.AspNetCore.Http.Connections.Tests
                     Assert.Equal(Stream.Null, connectionHttpContext.Response.Body);
                     Assert.NotNull(connectionHttpContext.Response.Headers);
                     Assert.Equal("application/xml", connectionHttpContext.Response.ContentType);
+                    var endpointFeature = connectionHttpContext.Features.Get<IEndpointFeature>();
+                    Assert.NotNull(endpointFeature);
+                    Assert.Equal("TestName", endpointFeature.Endpoint.DisplayName);
                 }
             }
         }