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Old 10-17-2021, 11:45 PM   #3
nathanleo
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Join Date: Jul 2017
Posts: 2,163
The simplest way to prevent PDF documents from appearing in search results is to add an X-Robots-Tag: noindex in the HTTP header used to serve the file. If they're already indexed, they'll drop out over time if you use the X-Robot-Tag with the noindex directive.
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