Get request headers from received request in fetch event.

I am trying to get the headers of received requests, but end up getting null for the following code:

export default {
    async fetch(request, env, ctx) {
        console.log(JSON.stringify(request.headers));
    }
}

export default {
    async fetch(request, env, ctx) {
        console.log(JSON.stringify(request.headers));
    }
}

3 Replies

kian•2y ago

export default {
    fetch(req) {
        return Response.json(Object.fromEntries(req.headers.entries()));
    },
};

export default {
    fetch(req) {
        return Response.json(Object.fromEntries(req.headers.entries()));
    },
};

saladOP•2y ago

oh, so it's req.headers.entries()? thanks

kian•2y ago

Entries returns an iterator of key/value pairs (https://developer.mozilla.org/en-US/docs/Web/API/Headers/entries) Object.fromEntries turns that into an object which you can then stringify - or generally do whatever with