Question

This seems like relatively straightforward code accessing a Google API endpoint with a Service Account- but I am getting Http Error 500

It works fine with the Tasks API, same authentication.

My source code:

import httplib2
import pprint
import sys

from apiclient.discovery import build
from oauth2client.client import SignedJwtAssertionCredentials

f = file('key.p12', 'rb')
key = f.read()
f.close()

credentials = SignedJwtAssertionCredentials(
'[e-mail]',
key,
scope='https://www.googleapis.com/auth/apps.order.readonly')

http = httplib2.Http()
http = credentials.authorize(http)
service = build("reseller", "v1", http=http)
lists = service.subscriptions().list().execute(http=http) 
print lists

Response:

HttpError: <unprintable HttpError object>

Traceback:

Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1701, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1689, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1358, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Library/Python/2.7/site-packages/flask/app.py", line 1344, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/admin/Sites/newmind/reseller-api/app.py", line 79, in index
    lists = service.subscriptions().list().execute(http=http)
  File "build/bdist.macosx-10.8-intel/egg/oauth2client/util.py", line 120, in positional_wrapper
    return wrapped(*args, **kwargs)
  File "build/bdist.macosx-10.8-intel/egg/apiclient/http.py", line 678, in execute
    raise HttpError(resp, content, uri=self.uri)

Copied the code directly from the Google Sample, just changed the name of the service and authentication.
http://code.google.com/p/google-api-python-client/source/browse/samples/service_account/tasks.py
The tasks API returns http 200 with the same credentials.

When I use a pretty standard httplib2 request, here’s the response I am getting:

WARNING:oauth2client.util:new_request() takes at most 1 positional argument (2 given)
    {'status': '500', 'content-length': '52', 'x-xss-protection': '1; mode=block', 'x-content-type-options': 'nosniff', 'expires': 'Sat, 20 Oct 2012 06:25:19 GMT', 'server': 'GSE', '-content-encoding': 'gzip', 'cache-control': 'private, max-age=0', 'date': 'Sat, 20 Oct 2012 06:25:19 GMT', 'x-frame-options': 'SAMEORIGIN', 'content-type': 'application/json; charset=UTF-8'}
    {
     "error": {
      "code": 500,
      "message": null
     }
    }

Answer 1

Somewhat of a long shot, but have you turned on the Reseller API in your project console? I remember having a similar issue when attempting to access a service other than the one I had initially used.

Edit: Per the comments below, an alternative solution was to use the Flow and set the access_type to offline to allow the token to be refreshed without requiring the user to constantly reauthenticate.