[feat] access to URISchemeRequest body on Linux

[JonasKruckenberg]

Is your feature request related to a problem? Please describe.

Both the Rust type URISchemeRequest and upstream WebKitURISchemeRequest do not expose a way to access the requests body. For a variety of usecases including Tauri's IPC system it would be great if we could actually access the main content of the request.

Describe the solution you'd like
Implement this functionality in upstream projects mirroring the one from WKWebView URLRequest namely httpBody and httpBodyStream so we can consume the body both blocking and through a Rust Stream.

Describe alternatives you've considered
Not have access to the body on Linux and marking this as a platform difference, but sadly this is kind of a really important core feature. It being absent makes the custom protocol pretty useless.

Would you assign yourself to implement this feature?

• Yes
• No

Additional context
Add any other context or screenshots about the feature request here.

[wusyong]

Do we have an upstream issue to track it?

[amrbashir]

I don't think we opened one for it yet.

[TingPing]

This is tricky to implement in WebKitGTK.

There is no "request body" sitting around, it is a GInputStream that is read on-demand as network writes happen. In order to access a body a complete copy would have to be stored in-memory, which isn't reasonable in some cases.

[JonasKruckenberg]

Let's expose that stream though, we actually care much more about that stream than a full body. Wry itself already has code to read a stream into a Vec<u8> on macOS too

[TingPing]

"Just expose a stream" still has complications. It is possible for a stream to be read-once. In which case you have to copy the entire thing into memory. It is also possible for a stream to be GSeekable and read multiple times but you can't seek a stream that is being actively read somewhere else.

[TingPing]

I am mostly thinking about this from a libsoup perspective, the http library webkitgtk uses, its possible things work out nicer inside of WebKit.

[wusyong]

Upstream issue created: https://bugs.webkit.org/show_bug.cgi?id=252564

[ModProg]

seems like the upstream issue was fixed: WebKit/WebKit#10714

[amrbashir]

right, this has been implemented in wry behind linux-body feature flag