refactor(core): add full http proxy and change workspace adaptor interface

[jlongster]

The previous approach was bad:

• It forces workspace adaptors to proxy a fetch request manually and it was too much work
• The fetch API wasn't a full http proxy; it didn't support websockets which will break stuff like our terminal support in the webapp

This changes it so a remote env just need to supply a remote HTTP URL and we will handle the full proxying for them

[mingfang]

this is super useful. would be great if we can configure proxies in opencode.json. (similar to vite.config)

[jlongster]

@mingfang go on? currently this is specifically for workspaces (when you create a session in a remote env that you'll be able to configure, not released yet) are you thinking something more general with the opencode server?

[mingfang]

@mingfang go on? currently this is specifically for workspaces (when you create a session in a remote env that you'll be able to configure, not released yet) are you thinking something more general with the opencode server?

Yes, make proxy a first class feature. I'm using the SDK from a webapp. My app requires hitting other APIs and many times encounter CORS issues. Currently I have Nginx in front to do the proxying. With your new feature, I was hoping to remove Nginx to reduce complexity.

[jlongster]

@mingfang unfortunately I'm not sure we're going to add a full proxy support to the opencode server to hit arbitrary endpoints. It's a bit outside the scope of opencode and we'd get all kind of support requests dealing with that (which is complex and tends to have a lot of edge cases)

this feature specifically is for our workspaces support, which is about to support a remote environment. we are specifically only proxying opencode requests from a "main" opencode instance to a "remote" one. because we are only proxing between opencode itself, we know what we need to support and it is a lot smaller support than an arbitrary proxy

[mingfang]

@jlongster no worries. I agree with you; it's out of scope.
Connecting opencode server like this sounds very interesting.
Where can I learn more about this, besides the code, I mean the future plans for this feature?
Thanks!