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Netlify allows you to set additional headers in a file called "_headers" This file should live in your "Publish directory" This is often called "public/", "dist/" or "site" If you are unsure you can check it in the Netlifying admin panel of your site under "Build & Deploy". The headers file allows you. to define headers for different URLs (for example. contact) or URL segments (for. example /*" for all URLs) of your page.