If you register a particular URI scheme in a WebContext, using
register_uri_scheme, you have to provide a
URISchemeRequestCallback. After that, when a URI response is made with
that particular scheme, your callback will be called. There you will be able to provide more response parameters when the methods and
properties of a URISchemeRequest is not enough.
When you finished setting up your URISchemeResponse, call webkit_uri_request_finish_with_response
with it to return the response.