Apache can use the mod_env module to configure the environment variables which are passed to CGI scripts and SSI pages. Use the Environment Variables page to configure the directives for this Apache module.
Use the Set for CGI Scripts section to set an environment variable that is passed to CGI scripts and SSI pages. For example, to set the environment variable MAXNUM to 50, click the Add button inside the Set for CGI Script section as shown in the section called Environment Variables and type MAXNUM in the Environment Variable text field and 50 in the Value to set text field. Click OK. The Set for CGI Scripts section configures the SetEnv directive.
Use the Pass to CGI Scripts section to pass the value of an environment variable when Apache was first started to CGI scripts. To see this environment variable, type the command env at a shell prompt. Click the Add button inside the Pass to CGI Scripts section and enter the name of the environment variable in the resulting dialog box. Click OK. The Pass to CGI Scripts section configures the PassEnv directive.
If you want to remove an environment variable so that the value is not passed to CGI scripts and SSI pages, use the Unset for CGI Scripts section. Click Add in the Unset for CGI Scripts section, and enter the name of the environment variable to unset. This corresponds to the UnsetEnv directive.