Enable Continuation frame for websocket communication

[michaelchao]

I have a websocket client and server, and server will send amount of data back to client when client is subscribing. As you know, data is very big, and I know there is an Continuation frame in websocket specific to separate data to multiple frames.
However, it seems that there is no available API to execute this target or I didn't find it, can somebody tells me? Thks:)