Fix test_new_file_via_rest This test was failing under python2. The cgi.py module was calling readline(1<<16). I was using the wasgiref/validate.py validator to make sure the wsgi protocol was correct. The validator replaces the normal readline with it's own wrapper. The wrapper doesn't support the max bytes to read value. The same module/wrapper in python 3 fixed this bug. So fixed this by disabling the validator under python2. Keeping it on python3 so we get its benefit.