Merge pull request #1039 from andersjonsson/missing-memorystream-seek…

…-in-processhttpoperation

reset memorystream to beginning

src/SoapCore/SoapEndpointMiddleware.cs

@@ -439,6 +439,7 @@ bool TryGetRequestValue(string key, out StringValues value)
 
 			bodyWriter.WriteBodyContents(dictionaryWriter);
 			dictionaryWriter.Flush();
+			ms.Seek(0, SeekOrigin.Begin);
 			await ms.CopyToAsync(context.Response.Body);
 		}