Empty user agent (Fetch API)

[bajtos]

When making Fetch API request, zinnia should report the runtime version and module name in the user agent.

IMO, the user agent string should be hard-coded, and modules should not be able to change it. At least not until we have very good reasons to allow them to do so.

At the moment, the user agent header is empty:

{
  "accept": "*/*",
  "accept-language": "*",
  "user-agent": "",
  "accept-encoding": "gzip, br",
  "host": "localhost:3000"
}

Echo HTTP server in Node.js:

require('http').createServer((req, res) => {
  res.write(JSON.stringify(req.headers, null, 2));
  res.end();
}).listen(3000)

Zinnia module making the request and producing the output shown at the top:

console.log(
  await (await fetch('http://localhost:3000/')).text()
);

Estimate: 1 day