Request to url_prefix yields wrong PATH_INFO

[t-8ch]

If the origin request path is exactly the same as the url_prefix the
resulting PATH_INFO equals the SCRIPT_NAME whereas it should be the empty string.

Example:

$ URL_PREFIX=/foo # imagine, waitress using this
$ curl localhost/foo
SCRIPT_NAME=/foo
PATH_INFO=/foo

PEP-333, the WSGI-specification says this:

PATH_INFO
    The remainder of the request URL's "path", designating the virtual "location" of the request's target within the application. This may be an empty string, if the request URL targets the application root and does not have a trailing slash.

Testcase:

def test_get_environ_with_url_prefix_empty_path(self):
    inst = self._makeOne()
    inst.channel.server.adj.url_prefix = '/foo'
    request = DummyParser()
    request.path = '/foo'
    inst.request = request
    environ = inst.get_environment()
    self.assertEqual(environ['PATH_INFO'], '')
    self.assertEqual(environ['SCRIPT_NAME'], '/foo')

I think the testcase collides with test_get_environment_path_empty.
But I think this test case is invalid, as a request with an empty path would
not be valid HTTP.

[mcdonc]

Thank you! I've fixed this in master.

[mcdonc]

Waitress 0.8.8 is out with this fix.

[t-8ch]

Many thanks for the fast fix and also waitress in general!