Cloudflare Developers•7mo ago

set cookie and redirect: Can't modify immutable headers.

I'm trying to set a session cookie and redirect with a 302 but appending the headers throws this exception: Can't modify immutable headers. TypeError: Can't modify immutable headers. let res = Response.redirect(url.origin+"/my/",302); res.headers.append("Set-Cookie", "sid=" + user.sid + "; Path=/; Secure; Max-Age=32000000; HttpOnly");

3 Replies

Paolo of Lost PagesOP•7mo ago

I "resolved" avoiding the problem by using an HTML meta redirect :/

Erisa•7mo ago

You need to clone the response object before modifying it https://developers.cloudflare.com/workers/examples/alter-headers/

    // Clone the response so that it's no longer immutable
    const newResponse = new Response(response.body, response);

    // Clone the response so that it's no longer immutable
    const newResponse = new Response(response.body, response);

Paolo of Lost PagesOP•7mo ago

Thank you!

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set cookie and redirect: Can't modify immutable headers.