Patch attached with test.In summary:A request to the url b'/\x80' appears to the application as a request to b'\xc2\x80' -- The issue being the latin1 decoded PATH_INFO is re-encoded as UTF-8 and then decoded as latin1(on the wire) b'\x80' -(decode latin1)-> u'\x80' -(encode utf-8)-> b'\xc2\x80' -(decode latin1)-> b'\xc2\x80'My patch cuts out the encode(utf-8)->decode(latin1)

A few typos in my previous comment, pressed enter too quickly, here's an updated comment:Patch attached with test.In summary:A request to the url b'/\x80' appears to the application as a request to b'/\xc2\x80' -- The issue being the latin1 decoded PATH_INFO is re-encoded as UTF-8 and then decoded as latin1    (on the wire) b'\x80' -(decode latin1)-> u'\x80' -(encode utf-8)-> b'\xc2\x80' -(decode latin1)-> u'\xc2\x80'My patch cuts out the encode(utf-8)->decode(latin1):    (on the wire) b'\x80' -(decode latin1) -> u'\x80'

Oops, broke b'/%80'.Here's a better fix that now takes:    (on the wire) b'\x80' -(decode latin1)-> u'\x80' -(encode utf-8)-> b'\xc2\x80' -(decode latin1)-> u'\xc2\x80'to:    (on the wire) b'\x80' -(decode latin1)-> u'\x80' -(encode latin1) -> b'\x80' -(decode latin1)-> u'\x80'

I was going to say your original fix was the reverse of a change inr86146. But you seem to be fixing the problems before I express them :)For the fix I would suggest something like unquote(path, "latin-1") would be simpler. I left some other review comments about the tests.

Updates after review.

Thanks, this version looks pretty good to me.

Forgot to remove the pyver code (leaning a bit too much on pre-commit)

New changeset1f2cfcd5a83f by Martin Panter in branch '3.5':Issue#26717: Stop encoding Latin-1-ized WSGI paths with UTF-8https://hg.python.org/cpython/rev/1f2cfcd5a83fNew changeset815a4ac67e68 by Martin Panter in branch 'default':Issue#26717: Merge wsgiref fix from 3.5https://hg.python.org/cpython/rev/815a4ac67e68

Why wsgiref uses latin1? It must use utf-8.

PEP3333 states that environ variables are str variables decoded usinglatin1:https://www.python.org/dev/peps/pep-3333/#id19Therefore, to get the original bytes, one must encode using latin1On Apr 20, 2016 3:46 AM, "Александр Эри" <report@bugs.python.org> wrote:>> Александр Эри added the comment:>> Why wsgiref uses latin1? It must use utf-8.>> ----------> keywords: +patch> nosy: +Александр Эри> Added file:http://bugs.python.org/file42531/simple_server.py.diff>> _______________________________________> Python tracker <report@bugs.python.org>> <http://bugs.python.org/issue26717>> _______________________________________>