[issue38863] Improve is_cgi() in http.server

[Dong-hee Na]

Dong-hee Na <donghee.na92 at gmail.com> added the comment:

@martin.panter, @asvetlov

I add the core developers who looks like to be experts on this module.
Can you follow up on Siwon's PR?

Thanks for your understanding.

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nosy: +asvetlov, martin.panter
versions:  -Python 3.6

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<https://bugs.python.org/issue38863>
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