302 Redirect headers are missing
Is it possible to extract the original headers from a worker fetch request to an end-point which returns a 302?
e.g.
const res = await fetch("http://localhost:3000/", {
"redirect": "manual"
})
res = {"body":{},"bodyUsed":false,"headers":{},"url":"http://localhost:3000/","redirected":false,"ok":false,"statusText":"Found","status":302}
If I run the same request via curl I get the original headers (e.g. location + set-cookie):
curl -v http://localhost:3000/
< HTTP/2 302
< cache-control: private
< location: https://www.google.com
< set-cookie: SIGNIN.REQUEST=1683699853; path=/; secure; HttpOnly
< access-control-expose-headers: Request-Context
< date: Tue, 09 May 2023 14:49:59 GMT
< content-length: 0
Is it possible to extract the original headers using Cloudflare workers (or any other Cloudflare service)?
The main problem is that the set-cookie header is lost.
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7 Replies
The headers shouldn't be lost - where are you seeing that? If you're only looking at the log of
res, you won't see headers due to how that gets serialised
You'll want to const headers = Object.fromEntries(res.headers.entries()) or something
Or just res.headers.get('location'), etc.I agree, but they are. The 302 response object only contains following properties.
{"body":{},"bodyUsed":false,"headers":{},"url":"http://localhost:3000/", "redirected":false,"ok":false,"statusText":"Found","status":302}
I think there is a limitation / restriction with fetch and response code 302. Is there any workaround?Where is that log from? Headers being empty is a misnomer - it’s not actually empty. That’s a result of how things get serialised for logs.
Try this, and log the object
Thanks! It worked with Object.fromEntries(res.headers.entries()), but console.log("Headers", JSON.stringify(res.headers.entries())) contains nothing
Yep entries is an iterator so you have to consume it first, then you can log it 😀
If you only need one header you can also just do this ^
Many thanks James! You saved my day 🙂
Happy to help!