Catch invalid errors in urllib2 from 2.4 and 2.5

urllib2 in Python 2.4 and 2.5 throws error for all non 200 responses.
Added support to catch these for 201 and 204 response codes.

Author: tnydwrds

ox3apiclient/__init__.py

@@ -140,7 +140,23 @@ def request(self, url, method='GET', headers={}, data=None, sign=False):
         if data:
             req.add_data(urllib.urlencode(req.get_data()))
 
-        return urllib2.urlopen(req)
+        # In 2.4 and 2.5, urllib2 throws errors for all non 200 status codes.
+        # The OpenX API uses 201 create responses and 204 for delete respones.
+        # We'll catch those errors and return the HTTPError object since it can
+        # (thankfully) be used just like a Response object. A handler is
+        # probably a better approach, but this is quick and works.
+        res = '[]'
+        try:
+            res = urllib2.urlopen(req)
+        except urllib2.HTTPError, err:
+            if err.code in [201, 204]:
+                res = err
+            else:
+                # TODO: Decide on format and what extra data to alert user for
+                # troubleshooting.
+                raise err
+
+        return res
 
     def fetch_request_token(self):
         """Helper method to fetch and set request token.