[issue4951] failure in test_httpservers

[Walter Dörwald <report@bugs.python.org> at psf.upfronthosting.co.za]

Walter Dörwald <walter at livinglogic.de> added the comment:

There's an EnvironmentVarGuard context manager in support.py that IMHO
should be used for recording changes to the environment variables. Or a
new context manager that does what your patch does could be put into
support.py. There might be other tests that benefit from that.

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nosy: +doerwalter

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