Technical SEO

X-Robots-Tag

An HTTP response header providing crawler instructions, including for non-HTML resources.

A practical example

A server sets noindex for a PDF file.

What should I know?

The browser does not display this header in the document body.

Technical SEO in practice

Check crawler access, server responses, and content processing separately. Then assess indexing and search appearance. These stages are connected but distinct and need different diagnostic methods.

Related Semly features

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Related terms

Meta robotsAn HTML tag giving crawlers supported instructions for indexing and displaying a page.HTTPA protocol for exchanging requests and responses between a client, such as a browser, and a server.PDFA document format preserving page layout, often used for reports, catalogs, and instructions.

Documentation and further reading

Definition prepared by Semly. Standards and behavior are described by their creators:

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