[issue26585] Use html.escape to replace _quote_html in http.server

[Martin Panter]

Martin Panter added the comment:

I left a couple notes on minor style nits (which I can fix when I commit this). But perhaps we should fix the business with tempdir_name and absolute URL paths (Issue 26609) first.

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dependencies: +Wrong request target in test_httpservers.py

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<http://bugs.python.org/issue26585>
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