NameError: global name 'HTTPError' is not defined

You probably just need to import the HTTPError class before using it. Try inserting at the top of your actions.py file:

from urllib2 import HTTPError

and then you should be able to use your code as is.

In Python 3 it's:

from urllib.error import HTTPError

You need to check for urllib2.HTTPError:

except urllib2.HTTPError:

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