Add feature to build for web

[Mubelotix]

The build for wasm32-unknown-unknown with ring used to fail, but with this feature it works out of the box

[cpu]

Isn't this something that could be activated outside of rustls by a dependent crate that wanted to use *ring* by taking its own direct dependency w/ the feature enabled?

If a feature for this were to be added here, should it also activate pki-types/web?

[djc]

Also should this be ring?/wasm32_unknown_unknown_js to avoid enabling the ring dependency in scenarios where the aws-lc-rs provider is actually selected?

[Mubelotix]

Isn't this something that could be activated outside of rustls by a dependent crate that wanted to use *ring* by taking its own direct dependency w/ the feature enabled?

If a feature for this were to be added here, should it also activate pki-types/web?

Yes indeed, they don't have the feature yet but I made a PR, let's wait to see if they merge it

[Mubelotix]

Also should this be ring?/wasm32_unknown_unknown_js to avoid enabling the ring dependency in scenarios where the aws-lc-rs provider is actually selected?

I thought it would only enable ring if I wrote it that way web = ["dep:ring", "ring/wasm32_unknown_unknown_js"] but I will check

[ctz]

I think we are probably overdue for regularising wasm support in this crate. What I mean by that is:

• a small example for one flavour of wasm or another (probably wasi is easiest?) and thereby document which features, providers, etc. are required -- ideally this would be a new way to build an existing example (eg, simpleclient).
• CI job that builds & runs that example to make sure we don't regress anything in the future.

[cpu]

@Mubelotix Are you interested in trying to achieve the broader changeset Ctz described above?

[Mubelotix]

@Mubelotix Are you interested in trying to achieve the broader changeset Ctz described above?

Sure. I only have experience with wasm in the browser though, so that's what the example would be about

[cpu]

I only have experience with wasm in the browser though, so that's what the example would be about

Personally my understanding of the general ecosystem here is lacking, but I think we have a light preference for WASI over an example fixed to the browser context. I don't know how far the two goals are from one another to gauge if it would be helpful to consider a browser example as a stepping stone towards a more complete WASI example.

[Mubelotix]

I only have experience with wasm in the browser though, so that's what the example would be about

Personally my understanding of the general ecosystem here is lacking, but I think we have a light preference for WASI over an example fixed to the browser context. I don't know how far the two goals are from one another to gauge if it would be helpful to consider a browser example as a stepping stone towards a more complete WASI example.

Ok I will look into WASI