How to attach cookie to request?

[vietan0 (Việt An)]

I want to send a request from the content script to an external site, which requires a cookie to authenticate. I’m already logged in so I got the cookie, but couldn’t attach it to the fetch.

await fetch(url, {
  headers: {
    Cookie: `lila2=${cookie}`,
  },
});

The response I got back was always 401 Unauthorized, and devtools showed that the request I sent didn’t contain the cookie at all. I even tried adding credentials: 'include' to the fetch’s options but nothing changed.

If I just paste the url into address bar, it works. But the same request from the extension has its cookies stripped out, it feels like. I don’t know where to go from here, is it actually not allowed in an extension?

[Espen_Klem]

credentials used to work?

Set cookie manually in fetch

I need to fetch some page in my firefox extension scripts. The page to be fetched returns valid content only when where is a valid cookie passed. I can fetch the cookies using browser.cookies API, but failed to set the cookie in the fetch request. Desired is there a way (I didn’t found) to make fetch automatically read the API, or allow set cookie manually ?

[vietan0 (Việt An)]

When I use credentials, I get error message:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at ...(the target url). (Reason: Credential is not supported if the CORS header ‘Access-Control-Allow-Origin’ is ‘*’)

So it seems it’s out of my control, not sure what else I can do here.