Set X-Robots-Tag Header On Plesk/Nginx

On a Plesk server with Nginx enabled here are the steps to setup custom X-Robot-Tag headers has described here:

https://developers.google.com/webmasters/control-crawl-index/docs/robots_meta_tag?csw=1

In Plesk control panel:

1. Select the domain

2. Click Web Server Settings

3. Scroll down to nginx settings

4. If you have “Serve static files directly by nginx” checked (which I recommend), you’ll need to remove the file extensions to which you’re going to apply headers. In this example remove “pdf” from the list.

5. In the “Additional nginx directives” field enter:

6. Click OK button to save changes.