handle redirect response explicitly (since switching to using keep-al…

…ive)

also fix packaging in setup.py to include webdriver_prefs.json

Fixes Issue SeleniumHQ#6452

py/selenium/webdriver/remote/remote_connection.py

@@ -386,6 +386,8 @@ def _request(self, url, data=None, method=None):
         try:
             if statuscode > 399 and statuscode < 500:
                 return {'status': statuscode, 'value': data}
+            if statuscode >= 300 and statuscode < 304:
+                return self._request(resp.getheader('location'), method='GET')
             body = data.decode('utf-8').replace('\x00', '').strip()
             content_type = []
             if resp.getheader('Content-Type') is not None:

setup.py

@@ -73,7 +73,7 @@
               'selenium.webdriver.remote',
               'selenium.webdriver.support', ],
     'package_data':{
-        'selenium.webdriver.firefox': ['*.xpi'],
+        'selenium.webdriver.firefox': ['*.xpi', 'webdriver_prefs.json'],
     },
     'data_files':[('selenium/webdriver/firefox/x86', ['py/selenium/webdriver/firefox/x86/x_ignore_nofocus.so']),
             ('selenium/webdriver/firefox/amd64', ['py/selenium/webdriver/firefox/amd64/x_ignore_nofocus.so'])],