fetch(request) ignores Request.signal

[Monti-27]

When fetch() is called with a Request object, Boa currently seems to ignore the signal stored on that request.

A simple repro is:

const ctrl = new AbortController();
const request = new Request("http://unit.test", { signal: ctrl.signal });
ctrl.abort("stop");
await fetch(request);

This should reject with the abort reason, but right now it fulfills.

The current path looks like it only reads signal from the second fetch(..., options) argument. When the resource is a Request, fetch_inner() clones the inner HTTP request, but JsRequest does not carry the signal through that path.

So the request level abort state gets lost before the fetcher sees it.

[Monti-27]

I'm working on this !!