Where can I read more about Request::create() and Route::dispatch()?

Question

Laravel

I came across this link in the code:

$request = Request::create('uri', 'POST');

return Route::dispatch($request);

it seems clear from the context what it is and what it does, but it was not found in the documentation.

moreover - even in docks on API did not find these methods.

mb I was looking in the wrong place, but ... in general, tell me please, where this topic is revealed more fully?

Thank you.