title: Google API HTTP exception handling doesn't work (python)
body: <p>I am trying to catch HTTP errors. I used following options:
  1) googleapiclient.errors.HttpError
  2) google.api_core.exceptions.NotFound</p>
  
  <p>Neither of these options work for me. Any ideas why? Thank you!</p>
  
  <pre><code>from pprint import pprint
  
  from googleapiclient import discovery, errors
  from oauth2client.client import GoogleCredentials
  #from google.api_core.exceptions import NotFound
  
  credentials = GoogleCredentials.get_application_default()
  
  service = discovery.build('compute', 'v1', credentials=credentials)
  
  # Project ID for this request.
  project = 'aweqwfnwrueifubwerfbiu'  # TODO: Update placeholder value.
  
  try:
      request = service.firewalls().list(project=project)
  except errors.HttpError:
      pprint('Error!')
  
  while request is not None:
      response = request.execute()
  
      for firewall in response['items']:
          # TODO: Change code below to process each `firewall` resource:
          pprint(firewall)
  
      request = service.firewalls().list_next(previous_request=request, previous_response=response)
  
  Traceback (most recent call last):
    File "test.py", line 20, in &lt;module&gt;
      response = request.execute()
    File "/lib/python3.6/site-packages/googleapiclient/_helpers.py", line 130, in positional_wrapper
      return wrapped(*args, **kwargs)
    File "/lib/python3.6/site-packages/googleapiclient/http.py", line 856, in execute
      raise HttpError(resp, content, uri=self.uri)
  googleapiclient.errors.HttpError: &lt;HttpError 404 when requesting https://compute.googleapis.com/compute/v1/projects/aweqwfnwrueifubwerfbiu/global/firewalls?alt=json returned "The resource 'projects/aweqwfnwrueifubwerfbiu' was not found"&gt;
  </code></pre>