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Why can I pass arbitrary environment variables to my CGI script using SetEnv in .htaccess?

April 26, 2017arbitrary CGI Environment pass Script setenv variables

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Why can I pass arbitrary environment variables to my CGI script using SetEnv in .htaccess?

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You can, but since suEXEC imposes restrictions on the environment variable names, the name must be prefixed with “HTTP_” or “SSL_”. You can also pass any environment variable in suEXEC’s “safe” list.