The DuBois book is based on mod_perl1 so not everything is applicable to mod_perl2.

According to this Apache documentation, http://perl.apache.org/docs/2.0/user/porting/compat.html#Special_Environment_Variables, the GATEWAY_INTERFACE environment variable can no longer be used to determine if mod_perl in use. Instead it says to use the MOD_PERL environment variable.

In reply to Re^4: mod_perl configuration of Apache2 by gmargo
in thread mod_perl configuration of Apache2 by Bruce32903

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