diff --git a/src/Ocelot/Request/Mapper/IRequestMapper.cs b/src/Ocelot/Request/Mapper/IRequestMapper.cs
index 9d34cbb2..941a24f7 100644
--- a/src/Ocelot/Request/Mapper/IRequestMapper.cs
+++ b/src/Ocelot/Request/Mapper/IRequestMapper.cs
@@ -7,6 +7,6 @@
 
     public interface IRequestMapper
     {
-        Response<HttpRequestMessage> Map(HttpRequest request);
+        Task<Response<HttpRequestMessage>> Map(HttpRequest request);
     }
 }
diff --git a/src/Ocelot/Request/Mapper/RequestMapper.cs b/src/Ocelot/Request/Mapper/RequestMapper.cs
index f417cc01..d0c45807 100644
--- a/src/Ocelot/Request/Mapper/RequestMapper.cs
+++ b/src/Ocelot/Request/Mapper/RequestMapper.cs
@@ -15,13 +15,13 @@
     {
         private readonly string[] _unsupportedHeaders = { "host" };
 
-        public Response<HttpRequestMessage> Map(HttpRequest request)
+        public async Task<Response<HttpRequestMessage>> Map(HttpRequest request)
         {
             try
             {
                 var requestMessage = new HttpRequestMessage()
                 {
-                    Content = MapContent(request),
+                    Content = await MapContent(request),
                     Method = MapMethod(request),
                     RequestUri = MapUri(request)
                 };
@@ -36,14 +36,15 @@
             }
         }
 
-        private HttpContent MapContent(HttpRequest request)
+        private async Task<HttpContent> MapContent(HttpRequest request)
         {
             if (request.Body == null || (request.Body.CanSeek && request.Body.Length <= 0)) 
             {
                 return null;
             }
 
-            var content = new StreamContent(request.Body);
+            // Never change this to StreamContent again, I forgot it doesnt work in #464.
+            var content = new ByteArrayContent(await ToByteArray(request.Body));
 
             if(!string.IsNullOrEmpty(request.ContentType))
             {
@@ -95,5 +96,17 @@
         {
             return !_unsupportedHeaders.Contains(header.Key.ToLower());
         }
+
+        private async Task<byte[]> ToByteArray(Stream stream)
+        {
+            using(stream)
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    await stream.CopyToAsync(memStream);
+                    return memStream.ToArray();
+                }
+            }
+        }
     }
 }
diff --git a/src/Ocelot/Request/Middleware/DownstreamRequestInitialiserMiddleware.cs b/src/Ocelot/Request/Middleware/DownstreamRequestInitialiserMiddleware.cs
index 2bdbec9f..4f3151d9 100644
--- a/src/Ocelot/Request/Middleware/DownstreamRequestInitialiserMiddleware.cs
+++ b/src/Ocelot/Request/Middleware/DownstreamRequestInitialiserMiddleware.cs
@@ -27,7 +27,7 @@ namespace Ocelot.Request.Middleware
 
         public async Task Invoke(DownstreamContext context)
         {
-            var downstreamRequest = _requestMapper.Map(context.HttpContext.Request);
+            var downstreamRequest = await _requestMapper.Map(context.HttpContext.Request);
 
             if (downstreamRequest.IsError)
             {
diff --git a/test/Ocelot.UnitTests/Request/DownstreamRequestInitialiserMiddlewareTests.cs b/test/Ocelot.UnitTests/Request/DownstreamRequestInitialiserMiddlewareTests.cs
index 9c5fb977..d571a8b7 100644
--- a/test/Ocelot.UnitTests/Request/DownstreamRequestInitialiserMiddlewareTests.cs
+++ b/test/Ocelot.UnitTests/Request/DownstreamRequestInitialiserMiddlewareTests.cs
@@ -95,7 +95,7 @@ namespace Ocelot.UnitTests.Request
 
             _requestMapper
                 .Setup(rm => rm.Map(It.IsAny<HttpRequest>()))
-                .Returns(_mappedRequest);
+                .ReturnsAsync(_mappedRequest);
         }
 
         private void GivenTheMapperWillReturnAnError()
@@ -104,7 +104,7 @@ namespace Ocelot.UnitTests.Request
 
             _requestMapper
                 .Setup(rm => rm.Map(It.IsAny<HttpRequest>()))
-                .Returns(_mappedRequest);
+                .ReturnsAsync(_mappedRequest);
         }
 
         private void WhenTheMiddlewareIsInvoked()
diff --git a/test/Ocelot.UnitTests/Request/Mapper/RequestMapperTests.cs b/test/Ocelot.UnitTests/Request/Mapper/RequestMapperTests.cs
index 17e35b64..9be76e3f 100644
--- a/test/Ocelot.UnitTests/Request/Mapper/RequestMapperTests.cs
+++ b/test/Ocelot.UnitTests/Request/Mapper/RequestMapperTests.cs
@@ -16,6 +16,7 @@
     using System.IO;
     using System.Text;
     using System.Security.Cryptography;
+    using System.Threading.Tasks;
 
     public class RequestMapperTests
     {
@@ -378,9 +379,9 @@
             _inputRequest.Body = null;
         }
 
-        private void WhenMapped()
+        private async Task WhenMapped()
         {
-            _mappedRequest = _requestMapper.Map(_inputRequest);
+            _mappedRequest = await _requestMapper.Map(_inputRequest);
         }
 
         private void ThenNoErrorIsReturned()