Option for coop and coep headers

[HKalbasi]

Several features of browser is not enabled due specture, unless a page declare itself as cross origin isolated by sending coop and coep headers to the browser. Notably, sharedArrayBuffer feature need those headers, which is required for testing rust programs with thread in web assembly. A --coi flag, similar to --cors that enables these headers would be great.

[weihanglo]

Could you elaborate more on the benefit of enabling sharedArrayBuffer for sfz? I have no idea the relations between them.

[HKalbasi]

It is useful for web developing. In my case, I'm trying to add rust analyzer to play.rust-lang.org . I serve the playground build folder via sfz, and everything is fine, except ra-wasm that isn't working because of sharedArrayBuffer. I think web developing is also the use case for --cors?