Feature/proxy reason phrase (#618)

* #599 started work to proxy reason phrase

* #599 test for aggregator

test/Ocelot.AcceptanceTests/AggregateTests.cs

@@ -559,7 +559,7 @@ namespace Ocelot.AcceptanceTests
             var merge = $"{one}, {two}";
             merge = merge.Replace("Hello", "Bye").Replace("{", "").Replace("}", "");
             var headers = responses.SelectMany(x => x.Headers).ToList();
-            return new DownstreamResponse(new StringContent(merge), HttpStatusCode.OK, headers);
+            return new DownstreamResponse(new StringContent(merge), HttpStatusCode.OK, headers, "some reason");
         }
     }
 }

test/Ocelot.AcceptanceTests/ReasonPhraseTests.cs

@@ -0,0 +1,76 @@
+namespace Ocelot.AcceptanceTests
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Net;
+    using Microsoft.AspNetCore.Http;
+    using Microsoft.AspNetCore.Http.Features;
+    using Ocelot.Configuration.File;
+    using Shouldly;
+    using TestStack.BDDfy;
+    using Xunit;
+
+    public class ReasonPhraseTests : IDisposable
+    {
+        private readonly Steps _steps;
+        private string _contentType;
+        private long? _contentLength;
+        private bool _contentTypeHeaderExists;
+        private readonly ServiceHandler _serviceHandler;
+
+        public ReasonPhraseTests()
+        {
+            _serviceHandler = new ServiceHandler();
+            _steps = new Steps();
+        }
+
+        [Fact]
+        public void should_return_reason_phrase()
+        {
+            var configuration = new FileConfiguration
+            {
+                ReRoutes = new List<FileReRoute>
+                    {
+                        new FileReRoute
+                        {
+                            DownstreamPathTemplate = "/",
+                            DownstreamScheme = "http",
+                            DownstreamHostAndPorts = new List<FileHostAndPort>
+                            {
+                                new FileHostAndPort
+                                {
+                                    Host = "localhost",
+                                    Port = 51339,
+                                }
+                            },
+                            UpstreamPathTemplate = "/",
+                            UpstreamHttpMethod = new List<string> { "Get" },
+                        }
+                    }
+            };
+
+            this.Given(x => x.GivenThereIsAServiceRunningOn("http://localhost:51339", "/", "some reason"))
+                .And(x => _steps.GivenThereIsAConfiguration(configuration))
+                .And(x => _steps.GivenOcelotIsRunning())
+                .When(x => _steps.WhenIGetUrlOnTheApiGateway("/"))
+                .And(_ => _steps.ThenTheReasonPhraseIs("some reason"))
+                .BDDfy();
+        }
+
+        private void GivenThereIsAServiceRunningOn(string baseUrl, string basePath, string reasonPhrase)
+        {
+            _serviceHandler.GivenThereIsAServiceRunningOn(baseUrl, basePath, async context =>
+            {
+                context.Response.HttpContext.Features.Get<IHttpResponseFeature>().ReasonPhrase = reasonPhrase;
+
+                await context.Response.WriteAsync("YOYO!");
+            });
+        }
+
+        public void Dispose()
+        {
+            _serviceHandler?.Dispose();
+            _steps.Dispose();
+        }
+    }
+}

test/Ocelot.AcceptanceTests/Steps.cs

@@ -452,6 +452,11 @@
             header.First().ShouldBe(value);
         }
 
+        public void ThenTheReasonPhraseIs(string expected)
+        {
+            _response.ReasonPhrase.ShouldBe(expected);
+        }
+
         /// <summary>
         /// This is annoying cos it should be in the constructor but we need to set up the file before calling startup so its a step.
         /// </summary>