Nginx HTTP Server - Fourth Edition

Substitution

Along the lines of the previous module, the Substitution module allows you to search and replace text directly from the response body:

sub_filter searched_text replacement_text;

This module is not included in the default Nginx build.

Two additional directives provide more flexibility:

• sub_filter_once (on or off, default on): Only replaces the text once, and stops after the first occurrence.
• sub_filter_types (default text/html): Affects additional MIME types that will be eligible for the text replacement. The * wildcard is allowed.