string|array header(string $key = null, string|array|null $default = null)

string clientExtension() Get the file's extension supplied by the client

__construct(mixed $data = null, int $status = 200, array $headers = array(), int $options)

bool ajax() Determine if the request is the result of an AJAX call.

$this withHeaders(array $headers) Add an array of headers to the response

Response handle(Request $request, int $type = HttpKernelInterface::MASTER_REQUEST, bool $catch = true)

string method() Get the request method. Return

$this withCookies(array $cookies) Add multiple cookies to the response