set request tokens on request made using fetch

[icewind1991]

Signed-off-by: Robin Appelman robin@icewind.nl

[skjnldsv]

Headers are not a simple object. It's a constructor:

https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch#Headers
https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch#Supplying_request_options

myHeaders = new Headers({
  "Content-Length": content.length.toString(),
  "X-Custom-Header": "ProcessThisImmediately",
});
myHeaders.append("Content-Type", "text/plain");

var myInit = { method: 'GET',
               headers: myHeaders,
               mode: 'cors',
               cache: 'default' };

fetch('flowers.jpg', myInit)

I don't know if forcing it to be an object like your implementation can lead to issues or not 🤔

[skjnldsv]

I'll also add that it's not available everywhere
https://caniuse.com/#feat=fetch

So like this it will initiate and create window.fetch even if fetch is not available, which can cause issues if any other software want to check if the browsers supports native fetch :)

[rullzer]

we do not use fetch anywhere I think. And we don't (or will soon no longer) ship babel polyfill. So i'm not sure this is needed or useful? @ChristophWurst @skjnldsv

[skjnldsv]

Yeah, let's close I guess :)