HTTP client

[bajtos]

Allow Station Modules to make HTTP requests (GET, POST, etc.) Ideally, we want to reuse Deno's implementation of the Fetch API from Web APIs.

Fetch API depends on Web Streams, which is tricky.

As a short-term shortcut, we can implement a subset of Fetch features ourselves, following the Fetch API spec as close as possible, with the intention to replace this limited implementation with a proper one from Deno at some point in the future. (Open a follow-up GH issue for that!)

It would be great to have the same Streams API for both HTTP and libp2p; see #9.

• JavaScript APIs
• Automated tests
• Documentation for module builders

[bajtos]

Pointers to get started:

• https://crates.io/crates/deno_fetch
• https://github.com/denoland/deno/tree/v1.30.3/ext/fetch
• https://github.com/denoland/deno/blob/f3fb8ee18826e66d3896ea864d2bedaed6c79308/runtime/worker.rs#L225-L237
• https://github.com/filecoin-station/zinnia/blob/18de0094d6503555a9ca096ab7348bb614e591e3/runtime/runtime.rs#L85-L91
• https://github.com/filecoin-station/zinnia/blob/18de0094d6503555a9ca096ab7348bb614e591e3/runtime/js/98_global_scope.js#L126-L127