Don't run requests through configuration middleware

While working on another PR that introduces another configuration middleware it dawned on me that we preferably don't requests through middleware that don't do anything.

This change will filter it out those middleware before they are passed into the MiddlewareRunner.

While running benchmarks I gained around a 10% requests per second gain when running it against example 63.

Author: WyriHaximus

src/HttpServer.php

@@ -247,6 +247,14 @@ public function __construct($requestHandlerOrLoop)
 
         $middleware = \array_merge($middleware, $requestHandlers);
 
+        /**
+         * Filter out any configuration middleware, no need to run requests through something that isn't
+         * doing anything with the request.
+         */
+        $middleware = \array_filter($middleware, function ($handler) {
+            return !($handler instanceof StreamingRequestMiddleware);
+        });
+
         $this->streamingServer = new StreamingServer($loop, new MiddlewareRunner($middleware));
 
         $that = $this;

tests/HttpServerTest.php

@@ -431,4 +431,27 @@ public function testConstructServerWithMemoryLimitDoesLimitConcurrency()
         $this->assertTrue(is_array($middleware));
         $this->assertInstanceOf('React\Http\Middleware\LimitConcurrentRequestsMiddleware', $middleware[0]);
     }
+
+    public function testConstructFiltersOutConfigurationMiddlewareBefore()
+    {
+        $http = new HttpServer(new StreamingRequestMiddleware(), function () { });
+
+        $ref = new \ReflectionProperty($http, 'streamingServer');
+        $ref->setAccessible(true);
+
+        $streamingServer = $ref->getValue($http);
+
+        $ref = new \ReflectionProperty($streamingServer, 'callback');
+        $ref->setAccessible(true);
+
+        $middlewareRunner = $ref->getValue($streamingServer);
+
+        $ref = new \ReflectionProperty($middlewareRunner, 'middleware');
+        $ref->setAccessible(true);
+
+        $middleware = $ref->getValue($middlewareRunner);
+
+        $this->assertTrue(is_array($middleware));
+        $this->assertCount(1, $middleware);
+    }
 }