add_header_handler

Description:

public uint add_header_handler (string @signal, string header, Callback callback, void* user_data)

Adds a signal handler to this for signal.

Similar to [[email protected]_connect], but the callback will only be run if this's incoming messages headers (that is, the `request_headers`) contain a header named header.

Parameters:

this	a Message
header	HTTP response header to match against
callback	the header handler
signal	signal to connect the handler to.
user_data	data to pass to `handler_cb`

Returns:

the handler ID from [[email protected]_connect]