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This chapter is from the book

This chapter is from the book

Monitoring Who Is Linking to Your Website

   SetEnvIfNoCase Referer www\.example\.com internalre-

   ferral

   LogFormat "%{Referer}i -> %U" referer

   CustomLog logs/referer.log referer env=!internalre-

   ferral

In order to monitor who is linking to your website, you can log the Referer: header from the request. This header contains the URL that linked to the page being requested. While not always present or accurate, it works for the majority of cases. This example shows how to use an environment variable to log the referrer information to a separate file. In this particular case, we are only interested in logging external referers, not those that come from an internal web page. To do so, in this example we check whether the referrer matches our own domain.

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