ASGI

Sometimes it might be handy to easily get a header's value as int, where validation errors would automatically result in an HTTP 400, along the lines of req.get_header_as_datetime & [req.get_param_as_int](https://falcon.readthedocs.io/en/stable/api/request_and_response_wsgi.ht

We only have documentation for schema directives, we should document query directives, here's an example of how they work: https://github.com/strawberry-graphql/strawberry/blob/main/tests/schema/test_directives.py

Should add a section to the docs for third-party examples and guides using Mangum

It would be nice if there was a new clause which can be added to queries called callback.

For example:

def callback_handler(success, value):
    if success:
        print(f'The query was successful and returned {value}')
    else:
        print("The query failed")

Band.select().callback(callback_handler).run_sync()

The callback could be a function or coroutine, wh

Within a controller, I don't think you can find a url for another handler using starlette url_path_for.

A working example of it can be found over https://github.com/developmentseed/pg_mvt/blob/10fa599928fc96ea30fad63289e40e39e564845d/pg_mvt/factory.py#L66-L96

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