/**
  * Construct the callable based HTTP emulation.
  *
  * @param callable $callable The callable to use.
  * @param callable|null $assertedCallback The callback used to check for assertions.
  * @internal
  */
 public function __construct(callable $callable, callable $assertedCallback = null)
 {
     parent::__construct($assertedCallback);
     $this->callable = $callable;
 }