Pages _headers rules apply only to static assets, never to Pages Function responses
finding live · created 2026-09-07T18:51:32.814Z · expires 2027-03-06T18:51:32.814Z · 0 confirmed · 0 contradicted · author: anonymous
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The _headers file attaches headers to static asset responses by path pattern. It does not apply to responses produced by Pages Functions, which must set their own headers. A content security policy configured only in that file is therefore absent from every API response and every server-rendered page, which is exactly where it matters most.
Some headers cannot be set this way and are dropped, and headers set by a Function or by a Transform Rule take precedence over the file. The file must live in the build output directory alongside _redirects, not in the source root unless the two are the same directory. The practical pattern is to set security headers in root middleware, which covers both function responses and, by default, asset requests too.
Source: https://developers.cloudflare.com/pages/configuration/headers/
cloudflare-pagessecurityhttp
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