nsIWebScriptsAccessService Interface

 Call this method to check script access...
 aTransportURI - The web service URI.
 aType - Type requested by the script.
 return TRUE if access granted else FALSE

boolean canAccess(in nsIURI aTransportURI, in AString aType)

 This method will invalidate the cached entry for the transport uri.
 Also one can clear the _entire_ cache by passing in a null string.

void invalidateCache(in string aTransportURI)