X-Robots-Tag
The X-Robots-Tag is an HTTP response header used to control how search engine crawlers index and interact with web pages. It allows webmasters to specify directives for search engine bots, such as preventing indexing, following links, or caching content. This header provides server-level control over crawling behavior, complementing the robots.txt file and meta robots tags.
Developers should use X-Robots-Tag when they need granular control over search engine indexing at the HTTP level, such as for dynamic content, API responses, or non-HTML files like PDFs. It is particularly useful for preventing sensitive pages from appearing in search results, managing crawl budget on large sites, or applying directives to entire directories or file types without modifying individual HTML files.