Why isn't there documentation for handlePreflightRequest?

[ghost]

It's not documented as an option here: https://github.com/socketio/socket.io/blob/master/docs/API.md#new-serverhttpserver-options

Even though this works: socketio/socket.io-client#1140 (comment)

[siddhant1]

Should i work on this one?

[5ebastianMeier]

Another problem is that this solution works perfectly, but breaks in an TypeScript environment because the typings in the package @types/socket.io also don't contain the option.

[NoniHunter]

Already documented here https://github.com/socketio/engine.io#methods-1 as part of Engine.IO.

[EO2875]

Yeah, this isn't a part of Socket.IO but of Express JS. These docs do show that option, but they link they reference "for mroe detail" does not show it.

[darrachequesne]

Documentation for v2: https://socket.io/docs/v2/handling-cors/

Documentation for v3: https://socket.io/docs/v3/handling-cors/