Changes following review

Author: JamesSinclairBiomni

src/System.Web.Http/Batch/DefaultHttpBatchHandler.cs

@@ -187,7 +187,7 @@ public virtual async Task<IList<HttpRequestMessage>> ParseBatchRequestsAsync(Htt
             foreach (HttpContent httpContent in streamProvider.Contents)
             {
                 cancellationToken.ThrowIfCancellationRequested();
-                HttpRequestMessage innerRequest = await httpContent.ReadAsHttpRequestMessageAsync(request.RequestUri.Scheme);
+                HttpRequestMessage innerRequest = request.RequestUri == null ? await httpContent.ReadAsHttpRequestMessageAsync() : await httpContent.ReadAsHttpRequestMessageAsync(request.RequestUri.Scheme);
                 innerRequest.CopyBatchRequestProperties(request);
                 requests.Add(innerRequest);
             }

test/System.Web.Http.Test/Batch/DefaultHttpBatchHandlerTest.cs

@@ -102,8 +102,7 @@ public async Task ProcessBatchAsync_CallsRegisterForDispose()
                 {
                     new HttpMessageContent(new HttpRequestMessage(HttpMethod.Get, "http://example.com/")),
                     new HttpMessageContent(new HttpRequestMessage(HttpMethod.Post, "http://example.org/"))
-                },
-                RequestUri = new Uri("http://example.com/")
+                }
             };
 
             var response = await batchHandler.ProcessBatchAsync(batchRequest, CancellationToken.None);
@@ -270,8 +269,7 @@ public async Task ParseBatchRequestsAsync_Returns_RequestsFromMultipartContent()
                 {
                     new HttpMessageContent(new HttpRequestMessage(HttpMethod.Get, "http://example.com/")),
                     new HttpMessageContent(new HttpRequestMessage(HttpMethod.Post, "http://example.com/values"))
-                },
-                RequestUri = new Uri("http://example.com/")
+                }
             };
 
             IList<HttpRequestMessage> requests = await batchHandler.ParseBatchRequestsAsync(request, CancellationToken.None);
@@ -316,8 +314,7 @@ public async Task ParseBatchRequestsAsync_CopiesPropertiesFromRequest_WithoutExc
                 {
                     new HttpMessageContent(new HttpRequestMessage(HttpMethod.Get, "http://example.com/")),
                     new HttpMessageContent(new HttpRequestMessage(HttpMethod.Post, "http://example.com/values"))
-                },
-                RequestUri = new Uri("http://example.com/")
+                }
             };
             request.Properties.Add("foo", "bar");
             request.SetRouteData(new HttpRouteData(new HttpRoute()));

test/System.Web.Http.WebHost.Test/BatchingTest.cs

@@ -43,8 +43,7 @@ public async Task WebHost_Batching_WithSpecialCharactersInUrl()
                 Content = new MultipartContent("mixed")
                 {
                     new HttpMessageContent(new HttpRequestMessage(HttpMethod.Post, "http://contoso.com/values/  space"))
-                },
-                RequestUri = new Uri("http://contoso.com/")
+                }
             };
 
             // Arrange