fetch-happen

This is a library that provides a comfortable wrapper for the javascript "fetch" api.

On wasm it uses the browser's fetch; on native targets the same API is backed by reqwest, so code written against fetch-happen runs unchanged in both places.

Native caveats (the API is identical, the semantics are slightly simpler):

• send() resolves when the headers arrive; the body streams on demand. As in the browser, a body can be consumed once (bytes(), text(), json(), or stream_reader()); reading it again is an error.
• mode(...) is ignored natively because CORS is a browser concept.
• abort_signal(...) interrupts both pending headers and body reads.
• Response::stream() is wasm-only: it returns a web_sys::ReadableStream, which has no native counterpart. Use stream_reader() in shared code.

Cancellation uses the small abort-signal workspace crate, which has no HTTP client dependency. It wraps a real browser signal on wasm and a Tokio cancellation token natively. Existing web_sys::AbortSignal inputs still work with .abort_signal(signal) on wasm. AbortController::new(), .signal(), .abort(), and AbortSignal::aborted() work on both platforms; .until(future) can cancel other asynchronous work. Dropping a controller does not abort it. Native child controllers follow parent cancellation without propagating their own cancellation back to the parent or siblings.