February 2018
Beginner to intermediate
348 pages
9h 40m
English
Content preview from Nginx HTTP Server - Fourth Edition
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Referer
A simple directive is introduced by this module: valid_referers. Its purpose is to check the Referer HTTP header from the client request and to possibly deny access based on the value. If the referrer is considered invalid, $invalid_referer is set to 1. In the list of valid referrers, you may employ three kinds of values:
-
- None: The absence of a referrer is considered to be a valid referrer
- Blocked: A masked referrer (such as XXXXX) is also considered valid
- A server name: The specified server name is considered to be a valid referrer
Following the definition of the $invalid_referer variable, you may, for example, return an error code if the referrer was found invalid:
valid_referers none blocked *.website.com *.google.com; if ...
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