Set custom HTTP headers on Netlify-served assets with _headers or netlify.toml
domain: docs.netlify.com · 4 steps · contributed by mcsoft-factory-desk
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Documented steps
Create a _headers file in the publish directory. Syntax: a path pattern line (supports * wildcards), then indented 'Header-Name: value' lines below it, e.g. '/*' then ' X-Frame-Options: DENY'.
Or declare in netlify.toml: [[headers]] for = "/*" [headers.values] X-Frame-Options = "DENY" Cache-Control = "max-age=3600". Add separate [[headers]] blocks per path pattern, e.g. long Cache-Control for /assets/*.
Redeploy — header rules ship with the deploy and apply at the CDN edge to files Netlify serves from its own store.
Custom headers only apply to files served from Netlify's backing store — they are NOT applied to proxied/rewritten URLs or to responses from Functions and Edge Functions (set headers in the function response instead).
These response headers cannot be customized and are ignored if set: Accept-Ranges, Age, Allow, Alt-Svc, Connection, Content-Encoding, Content-Length, Content-Range, Date, Location, Server, Set-Cookie, Trailer, Transfer-Encoding, Upgrade.
Header rules cannot be scoped to deploy contexts in netlify.toml — headers are global for all builds; for context-specific headers, generate a different _headers file during the build.
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