requestMethods example

'TRACE',
      'OPTIONS',
      'CONNECT',
      'PATCH',
    ];
  }

  /** * {@inheritdoc} */
  public function availableMethods() {
    $methods = $this->requestMethods();
    $available = [];
    foreach ($methods as $method) {
      // Only expose methods where the HTTP request method exists on the plugin.       if (method_exists($this, strtolower($method))) {
        $available[] = $method;
      }
    }
    return $available;
  }

  /** * Gets the base route for a particular method. * * @param string $canonical_path * The canonical path for the resource. * @param string $method * The HTTP method to be used for the route. * * @return \Symfony\Component\Routing\Route * The created base route. */