Protocol error "Reserved frame bit has not been negociated." while retrieving a big json binary

[Helloyunho]

So I was making a small program. I used Starscream for the client and swifter for the server.

But here's the problem: My program can send some big JSONs(since it sends files and all of the binaries are get encoded to base64). But if I send about over 100,000 bytes of JSON, swifter says Reserved frame bit has not been negociated. and it disconnects the client.