[fetch] The reason why Access-Control-Request-Headers includes simple headers (#249)

/cc @mattto

IIUC, the Access-Control-Request-Headers is built by scanning all the entries in `request`'s header list's headers, and therefore it includes the names of the simple headers if any. Right?

If so, is there any reason to do so? We just found that the Firefox doesn't include them while Chrome does.

Including simple ones provide more info to the server via the preflight, but it should be not so important?

When checking the response, only request headers that are not simple are compared with the Access-Control-Allow-Headers. So, the server doesn't need to know simple ones for building the Access-Control-Allow-Headers.

---
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/fetch/issues/249