/** * Cleans the output buffer and builds a default HTTP 200 OK "Allow" response to an OPTIONS request. */ private function prepareOptionsResponse() { ob_clean(); // Determine which options have been set up for this route based on the registered routes $optionsForRoute = $this->router->getOptions($this->request); $methodsAllowed = [RequestMethod::OPTIONS]; foreach ($optionsForRoute as $route) { // Extend the set of acceptable methods with the ones set up for this route $acceptableMethods = $route->getAcceptableMethods(); $methodsAllowed = array_merge_recursive($methodsAllowed, $acceptableMethods); } array_unique($methodsAllowed); $this->response = new Response(); $this->response->setResponseCode(ResponseCode::HTTP_OK); $this->response->setHeader('Allow', implode(',', $methodsAllowed)); $this->response->setBody(''); $this->context->registerInstance($this->response); $this->finalizeOutputBuffer(); }