How to trigger websocket frame fragmentation from the client?

Question

I'm building a Web socket server, however, for testing purposes, I'd like Chrome or Firefox or any other browser to send the message fragmented so I can test my implementation.

I've tried even sending 100K text data and the FIN flag is always set to 1 and the opcode is TEXT.

Is there a way to manually trigger fragmented frames? Any client out there with more flexibility?

Answer 1

The Javascript WebSocket API does not expose this option. I recently ran into the same frustration when some more modern browsers (A Chromium derivative) was unpredictably sending fragmented WebSocket frames.

For testing I rolled my own TCP client sending pre-calculated fragmented WebSocket frames. Not ideal, but it got the job done, and AFAIK there's no alternative yet.