The mod_lua docs state that subprocess_env can be used to access
process environment variables [1] It appears to imply that the script
can access standard CGI variables.

However, the only variables that seem to be defined are:

SCRIPT_URI
SCRIPT_URL

There also does not seem to be a way to enumerate the list of variables.
(I found the above by trying the names that are visible to Perl and Python)

How does one get at the other variables?

If there is a restriction on what subprocess_env provides, it would be
helpful if it were documented.

[1] https://httpd.apache.org/docs/trunk/mod/mod_lua.html

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