Please provide a link to the specification: https://tools.ietf.org/html/rfc6455 There is nothing in this specs that says a server should mask anything This leads to connection abort with libsoup

Thanks for the report. Problem seems to be that mod_websocket just returns the ping frame as is after changing opcode to pong, which preserves the mask flag.

• owner Zash
• tags Milestone-0.11 Status-Started

Fixed in https://hg.prosody.im/0.11/rev/10d6d0d91f4e despite being unable to reproduce the problem. The change doesn't appear to break anything tho and should be safe.

• tags Status-Fixed

Reproduced with libsoup 2.68.2 in a Debian testing container.