process_outgoing_message

Description:

public virtual Bytes process_outgoing_message (ref uint8 header, owned Bytes payload) throws Error

Process a message before it's sent.

If the payload isn't changed the given payload is just returned, otherwise [method@Glib.Bytes.unref] is called on the given payload and a new [struct@GLib.Bytes] is returned with the new data.

Extensions using reserved bits of the header will change them in header.

Parameters:

this	a WebsocketExtension
header	the message header
payload	the payload data

Returns:

the message payload data, or null in case of error