ws send() masks frames which it must not when sending to the client

[drdreo]

The current mod.ts in std/ws masks the frame on send() which errors in the browser with the message: "A server must not mask any frames that it sends to the client."

Playing around with a websocket chat as an example: https://github.com/drdreo/deno-chat
I copied the mod.ts and simply not creating the mask fixed that error for me.

this.mask = opts.mask ;
// this.mask = opts.mask || createMask();

[keroxp]

Correct. This may be violation of WebSocket standard on server side.