See the full response headers your server sends.
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Response headers carry information that never appears in the HTML: caching rules, compression, security policy, server software and indexing directives. When a page behaves oddly and the source looks fine, the answer is usually here.
They can control indexing (X-Robots-Tag), caching, compression and redirects. An X-Robots-Tag noindex is invisible in the HTML and removes the page from search entirely.
A header that does the same job as the meta robots tag. It is commonly used for PDFs and other non-HTML files, and occasionally left on by mistake after a staging deployment.
It is good practice. It offers attackers a small amount of free reconnaissance and offers you nothing.
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