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.

Parameters:
frame The frame where the data request will be reported.
Returns:
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).