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Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition by Paul Hudson, Andrew Hudson, Matthew Helmke

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mod_setenvif

mod_setenvif allows manipulation of environment variables. Using small snippets of text-matching code known as regular expressions, you can conditionally change the content of environment variables. The order in which SetEnvIf directives appear in the configuration files is important. Each SetEnvIf directive can reset an earlier SetEnvIf directive when used on the same environment variable. Be sure to keep that in mind when using the directives from this module.

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