const char * vortex_frame_get_transfer_encoding ( VortexFrame frame  ) 

Allows to get current Content-Transfer-Encoding mime header configuration for the given frame (if defined).

NOTE: this function is deprecated. Use generic MIME header access through vortex_frame_get_mime_header.

frame The frame where the data request will be reported.
Current mime header configuration request or NULL if not defined (because the frame received is NULL or because the frame do not contains a MIME message).