X-Robots-Tag in HTTP Header

Robots Meta tag is implemented to control the crawling and indexing of that particular page. But in some cases, the implementation of a Robots Meta tag is not possible. The reasons can be
a) The file type is non-HTML. Meta Robots tag can’t be implemented .doc, .pdf, .xls, video or audio files.
b) where the editing of the code or content of an HTML file is not possible.
c) Sites with large amounts of changing content, where updating individual files is too hard or expensive.
In such a case, X-Robots-Tag is the solution. An X-Robots-Tag is an element in HTTP header which can contain same values as the Robots META tags.
This can be done using by sever-side tools so that this information is generated by web server.
Given below is the example to avoid indexing .doc files through .htaccess.

Header set X-Robots-Tag "NOINDEX, NOFOLLOW"
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