Don't 500 when PATH_INFO is not valid utf-8 - #500
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WSGI gives latin-1. A request for /%c0 is a probe, not a reason to UnicodeDecodeError out of encget.
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encgetre-decodes latin-1 PATH_INFO asurl_encoding(utf-8). A request for/%c0is valid WSGI and a common scanner probe; it is not valid utf-8, sorequest.path/request.urlraised UnicodeDecodeError.If that decode fails, keep the latin-1 value.
Fixes #464