When a request comes in, web servers decode the path. The decoded path
may contain UTF-8 characters, But according to the WSGI spec, no
strings can contain chars outside ISO-8859-1. Therefore, to reconcile
the URI encoding standard that allows UTF-8 with the WSGI spec that does
not, WSGI servers tunnel the string via ISO-8859-1.
falcon.testing.create_environ() needs to mimics this behavior, e.g.:
tunnelled_path = path.encode('utf-8').decode('iso-8859-1')
falcon.Request already does the following to reverse the process:
path = tunnelled_path.encode('iso-8859-1').decode('utf-8', 'replace')
Fixes #817
3d186c3296