Fix handling HTTP responses without a body (#412)

Author: AnatoliB

src/Utility/TypeExtensions.cs

@@ -166,10 +166,9 @@ private static RpcHttp ToRpcHttp(this HttpResponseContext httpResponseContext)
                 StatusCode = httpResponseContext.StatusCode.ToString("d")
             };
 
-            if (httpResponseContext.Body != null)
-            {
-                rpcHttp.Body = httpResponseContext.Body.ToTypedData();
-            }
+            rpcHttp.Body = httpResponseContext.Body == null
+                            ? string.Empty.ToTypedData()
+                            : httpResponseContext.Body.ToTypedData();
 
             rpcHttp.EnableContentNegotiation = httpResponseContext.EnableContentNegotiation;
 

test/Unit/Utility/TypeExtensionsTests.cs

@@ -576,6 +576,31 @@ public void TestObjectToTypedData_WhenBodyIsNotJsonAndContentTypeIsSpecified_Add
             Assert.Equal("text/html", input.ToTypedData().Http.Headers["content-type"]);
         }
 
+        [Theory]
+        [InlineData(null, HttpStatusCode.OK)]
+        [InlineData("text/plain", HttpStatusCode.OK)]
+        [InlineData("application/json", HttpStatusCode.OK)]
+        [InlineData("anything/else", HttpStatusCode.OK)]
+        [InlineData(null, HttpStatusCode.NoContent)]
+        [InlineData("text/plain", HttpStatusCode.NoContent)]
+        [InlineData("application/json", HttpStatusCode.NoContent)]
+        [InlineData("anything/else", HttpStatusCode.NoContent)]
+        public void TestObjectToTypedData_WhenBodyIsNull(string contentType, HttpStatusCode statusCode)
+        {
+            var input = new HttpResponseContext
+            {
+                Body = null,
+                ContentType = contentType,
+                StatusCode = statusCode,
+            };
+
+            var result = input.ToTypedData().Http;
+
+            Assert.Equal(string.Empty, result.Body.String);
+            var expectedContentType = contentType ?? "text/plain";
+            Assert.Equal(expectedContentType, result.Headers["content-type"]);
+        }
+
         [Fact]
         public void TestObjectToTypedDataInt()
         {