Redirects are not handled in fetch()

[nabetti1720]

In other implementations (node, bun, etc.), when fetching the specified URI, a redirect is processed and the final response (status code 200) is returned, but in llrt, the redirect is not processed and status code 301 is returned.

Reproduction procedure:

// fetch.js
const main = async () => {
  try {
    const response = await fetch('https://google.com');
    console.log(response.status);
    console.log(response.headers.get('location'));
  } catch(e) {
    console.log(e);
  }
}

main();

Execution results in llrt:

shinya@MBA2022M2 llrt-test % ./llrt fetch.js 
301
https://www.google.com/

Execution results in bun:

shinya@MBA2022M2 llrt-test % bun fetch.js 
200
null

[richarddavison]

Thanks for the well documented report. PR is welcome, want to take shot at it? This could be implemented as looping over the response until no redirect header is present if redirect option is set to follow on the Request or fetch options. https://github.com/awslabs/llrt/blob/d05da26103acc1fdf45afe15965ef05013e5f488/src/http/fetch.rs#L81

[nabetti1720]

Hi @richarddavison , I would love to work on this assignment if the opportunity arises :)