Called on the IO thread before a resource request is loaded. The |browser|
and |frame| values represent the source of the request, and may be NULL
for requests originating from service workers or cef_urlrequest_t. To
redirect or change the resource load optionally modify |request|.
Modification of the request URL will be treated as a redirect. Return
RV_CONTINUE to continue the request immediately. Return RV_CONTINUE_ASYNC
and call cef_callback_t functions at a later time to continue or cancel
the request asynchronously. Return RV_CANCEL to cancel the request
immediately.
Called on the IO thread before a resource request is loaded. The |browser| and |frame| values represent the source of the request, and may be NULL for requests originating from service workers or cef_urlrequest_t. To redirect or change the resource load optionally modify |request|. Modification of the request URL will be treated as a redirect. Return RV_CONTINUE to continue the request immediately. Return RV_CONTINUE_ASYNC and call cef_callback_t functions at a later time to continue or cancel the request asynchronously. Return RV_CANCEL to cancel the request immediately.