React to IHeaderDictionary ContentLength change

Author: benaadams

src/Benchmarks/Middleware/MemoryCachePlaintextMiddleware.cs

@@ -40,12 +40,12 @@ public Task Invoke(HttpContext httpContext)
                     }
                 }
 
-                httpContext.Response.StatusCode = 200;
-                httpContext.Response.ContentType = "text/plain";
-                // HACK: Setting the Content-Length header manually avoids the cost of serializing the int to a string.
-                //       This is instead of: httpContext.Response.ContentLength = payload.Length;
-                httpContext.Response.Headers["Content-Length"] = "13";
-                return httpContext.Response.Body.WriteAsync(payload, 0, payload.Length);
+                var payloadLength = payload.Length;
+                var response = httpContext.Response;
+                response.StatusCode = 200;
+                response.ContentType = "text/plain";
+                response.ContentLength = payloadLength;
+                return response.Body.WriteAsync(payload, 0, payloadLength);
             }
 
             return _next(httpContext);

src/Benchmarks/Middleware/MemoryCachePlaintextSetRemoveMiddleware.cs

@@ -34,12 +34,12 @@ public Task Invoke(HttpContext httpContext)
                 _memoryCache.Set(_key, _helloWorldPayload);
                 _memoryCache.Remove(_key);
 
-                httpContext.Response.StatusCode = 200;
-                httpContext.Response.ContentType = "text/plain";
-                // HACK: Setting the Content-Length header manually avoids the cost of serializing the int to a string.
-                //       This is instead of: httpContext.Response.ContentLength = payload.Length;
-                httpContext.Response.Headers["Content-Length"] = "13";
-                return httpContext.Response.Body.WriteAsync(_helloWorldPayload, 0, _helloWorldPayload.Length);
+                var response = httpContext.Response;
+                var payloadLength = _helloWorldPayload.Length;
+                response.StatusCode = 200;
+                response.ContentType = "text/plain";
+                response.ContentLength = payloadLength;
+                return httpContext.Response.Body.WriteAsync(_helloWorldPayload, 0, payloadLength);
             }
 
             return _next(httpContext);

src/Benchmarks/Middleware/PlaintextMiddleware.cs

@@ -34,12 +34,11 @@ public Task Invoke(HttpContext httpContext)
 
         public static Task WriteResponse(HttpResponse response)
         {
+            var payloadLength = _helloWorldPayload.Length;
             response.StatusCode = 200;
             response.ContentType = "text/plain";
-            // HACK: Setting the Content-Length header manually avoids the cost of serializing the int to a string.
-            //       This is instead of: httpContext.Response.ContentLength = _helloWorldPayload.Length;
-            response.Headers["Content-Length"] = "13";
-            return response.Body.WriteAsync(_helloWorldPayload, 0, _helloWorldPayload.Length);
+            response.ContentLength = payloadLength;
+            return response.Body.WriteAsync(_helloWorldPayload, 0, payloadLength);
         }
     }