diff --git a/Octokit.Tests/Http/ConnectionTests.cs b/Octokit.Tests/Http/ConnectionTests.cs
index 13b20e19..d1eb8511 100644
--- a/Octokit.Tests/Http/ConnectionTests.cs
+++ b/Octokit.Tests/Http/ConnectionTests.cs
@@ -1,4 +1,6 @@
 using System;
+using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Net;
 using System.Net.Http;
@@ -233,6 +235,31 @@ namespace Octokit.Tests.Http
             }
         }
 
+        public class ThePostRawAsyncMethod
+        {
+            [Fact]
+            public async Task RunsConfiguredAppWithAppropriateEnv()
+            {
+                var httpClient = Substitute.For<IHttpClient>();
+                IResponse<string> response = new ApiResponse<string>();
+                httpClient.Send<string>(Args.Request).Returns(Task.FromResult(response));
+                var connection = new Connection(ExampleUri,
+                    Substitute.For<ICredentialStore>(),
+                    httpClient,
+                    Substitute.For<IJsonSerializer>());
+
+                var body = new MemoryStream(new byte[] { 48, 49, 50 });
+                var headers = new Dictionary<string, string> { { "Content-Type", "application/arbitrary" } };
+                await connection.PostRawAsync<string>(new Uri("https://other.host.com/path?query=val"), body, headers);
+
+                httpClient.Received().Send<string>(Arg.Is<IRequest>(req =>
+                    req.BaseAddress == ExampleUri &&
+                    req.Body == body &&
+                    req.Method == HttpMethod.Post &&
+                    req.Endpoint == new Uri("https://other.host.com/path?query=val")));
+            }
+        }
+
         public class TheDeleteAsyncMethod
         {
             [Fact]
diff --git a/Octokit/Http/Connection.cs b/Octokit/Http/Connection.cs
index ac16394f..43814f7a 100644
--- a/Octokit/Http/Connection.cs
+++ b/Octokit/Http/Connection.cs
@@ -102,6 +102,32 @@ namespace Octokit.Http
             return await SendData<T>(endpoint, HttpMethod.Post, body);
         }
 
+        public async Task<IResponse<T>> PostRawAsync<T>(Uri endpoint, System.IO.Stream body, IDictionary<string, string> headers)
+        {
+            Ensure.ArgumentNotNull(endpoint, "endpoint");
+            Ensure.ArgumentNotNull(body, "body");
+
+            var request = new Request
+            {
+                Method = HttpMethod.Post,
+                BaseAddress = BaseAddress,
+                Endpoint = endpoint,
+                Body = body
+            };
+            if (headers != null)
+            {
+                foreach (var header in headers)
+                {
+                    request.Headers[header.Key] = header.Value;
+                }
+            }
+            authenticator.Apply(request);
+            var response = await httpClient.Send<T>(request);
+            apiInfoParser.ParseApiHttpHeaders(response);
+            jsonPipeline.DeserializeResponse(response);
+            return response;
+        }
+
         public async Task<IResponse<T>> PutAsync<T>(Uri endpoint, object body)
         {
             return await SendData<T>(endpoint, HttpMethod.Put, body);
@@ -200,10 +226,5 @@ namespace Octokit.Http
                 throw new ApiException(response.Body, response.StatusCode);
             }
         }
-
-        public Task<IResponse<T>> PostRawAsync<T>(Uri endpoint, System.IO.Stream body, IDictionary<string, string> headers)
-        {
-            throw new NotImplementedException();
-        }
     }
 }
diff --git a/Octokit/Http/HttpClientAdapter.cs b/Octokit/Http/HttpClientAdapter.cs
index b0a1461e..9cfbcd5d 100644
--- a/Octokit/Http/HttpClientAdapter.cs
+++ b/Octokit/Http/HttpClientAdapter.cs
@@ -58,6 +58,11 @@ namespace Octokit.Http
                 {
                     requestMessage.Content = new StringContent(body, Encoding.UTF8);
                 }
+                var bodyStream = request.Body as System.IO.Stream;
+                if (bodyStream != null)
+                {
+                    requestMessage.Content = new StreamContent(bodyStream);
+                }
             }
             catch (Exception)
             {