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that function is not present either (e.g. on Macintosh), only Python
scripts are supported, and they are executed by the current process.

In all cases, the implementation is intentionally naive -- all
requests are executed sychronously.

SECURITY WARNING: DON'T USE THIS CODE UNLESS YOU ARE INSIDE A FIREWALL
-- it may execute arbitrary Python code or external programs.

Note that status code 200 is sent prior to execution of a CGI script, so
scripts cannot send other status codes such as 302 (redirect).
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    Given a URL path, remove extra '/'s and '.' path elements and collapse
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