Support for permessage-deflate [STATUS: https://github.com/snapview/tungstenite-rs/issues/2#issuecomment-3534187538]

[nox]

This is a mandatory part of the spec, and is thus needed to be Web-compatible.

[agalakhov]

Thanks, it will be done. The only reason not having it already is, we don't use it ourselves, and the library was written for our production use.

Note for myself: it is RFC 7692.

[nox]

I think I brainfarted when I thought it is mandatory.

[agalakhov]

At least it is required by Autobahn, that's enough for me :)

Currently tungstenite passes all the Autobahn tests with only two of them as "non-strict", and my plan is to achieve 100% strict (I know what exactly fails). For comparison, ws-rs has 11 non-stricts and others are even worse. So the support for RFC 7692 is needed at least to have 100% green lines here. :)

[nox]

It is actually mandatory for a user agent, see step 9 of https://fetch.spec.whatwg.org/#concept-websocket-establish.

[dariost]

As a suggestion I'd say to implement this using something like flate2 and not libz-sys in order to avoid external dependencies on system libraries

[Fedcomp]

Is it still planned? ws-rs support permessage-deflate but does not support async :(

[daniel-abramov]

Yes, we still plan to work on it, but unfortunately we did not have time to work on it yet as it was lower in priorities than other things which we fixed / improved since then.

[AlexDaniel]

Any updates on this? This is the current state of permessage-deflate in rust's websocket libraries:

• websocket does not support permessage-deflate (Support permessage-deflate websockets-rs/rust-websocket#123)
• The repo for twist seems to be gone (https://github.com/rustyhorde/twist)
• tungstenite does not support permessage-deflate (You are here!)
• ws is the only one that supports permessage-deflate, but it is abandoned. There is a security issue that is fixed in its fork parity-ws, but it also does not seem to be actively maintained. Unfortunately, compression in ws-rs no longer works with the newest versions of rustc: DeflateHandler no longer works with newer versions of rustc housleyjk/ws-rs#330
• Can't find info about permessage-deflate in websocket-lite but it probably isn't supported
• yarws supports permessage-deflate but only for incoming messages (I need it for outgoing messages)

[tinaun]

#144

[daniel-abramov]

Someone needs to update the #144 to the newest state (resolve the conflicts and fix some remarks in code), once it's done and clean, we could merge it. Unfortunately we don't plan to make changes at this particular place in the nearest future, but if someone makes a PR and/or updates the existing #144 which seems to be [almost] ready (?), we would be glad to review and merge it.

[Fedcomp]

We should probably mention @SirCipher to update pull request :)

[SirCipher]

@application-developer-DA, @Fedcomp, sorry for the delay, we've been updating to Tokio 0.3. The work is nearly done and I'll update the PR soon.