The NPAPI currently allows adding HTTP headers to a POST request, by prepending them to the POST body in NPN_PostURL and NPN_PostURLNotify. We (Flash Runtime) would like for plugins to be able to add HTTP headers to GET requests as well.
NPError NPN_GetURLNotifyHeaders ( NPP instance, const char* url, const char* target, void* notifyData, const char* headers );
/* Identical to NPN_GetURLNotify, except for the new parameter 'headers', * which specifies additional request headers. These are separated by \n * characters (NOT \r\n), and terminated by \n\0 (NOT \n\n\0). The browser * appends these headers to the request verbatim, inserting them after the * headers automatically generated by the browser. The browser does NOT * attempt to detect conflicts between its own headers and those specified * by the plugin; if the plugin specifies headers that overlap with browser * headers, the conflicting headers will simply be sent verbatim. *