Pulp

https://pulp.readthedocs.org/en/latest/dev-guide/integration/rest-api/repo/sync.html#listing-a-single-scheduled-sync

$ curl -H "Accept: application/json" -i -X GET -k -u admin:admin 'https://localhost/pulp/api/v2/repositories/553fe483-9a33-4491-9e06-d6e9ad461b69/importers/yum_importer/schedules/sync/56cf1041e138236f5fd9a3f5/'

HTTP/1.1 500 INTERNAL SERVER ERROR
Date: Thu, 25 Feb 2016 14:32:43 GMT
Server: Apache/2.4.18 (Fedora) OpenSSL/1.0.2e-fips mod_wsgi/4.4.8 Python/2.7.10
Content-Length: 1408
Content-Encoding: utf-8
Connection: close
Content-Type: application/json; charset=utf-8

{
    "_href": "/pulp/api/v2/repositories/553fe483-9a33-4491-9e06-d6e9ad461b69/importers/yum_importer/schedules/sync/56cf1041e138236f5fd9a3f5/",
    "error_message": "'RepoSyncScheduleManager' object has no attribute 'validate_importer'",
    "exception": [
        "AttributeError: 'RepoSyncScheduleManager' object has no attribute 'validate_importer'\n"
    ],
    "http_request_method": "GET",
    "http_status": 500,
    "traceback": [
        "  File \"/usr/lib/python2.7/site-packages/django/core/handlers/base.py\", line 132, in get_response\n    response = wrapped_callback(request, *callback_args, **callback_kwargs)\n",
        "  File \"/usr/lib/python2.7/site-packages/django/views/generic/base.py\", line 71, in view\n    return self.dispatch(request, *args, **kwargs)\n",
        "  File \"/usr/lib/python2.7/site-packages/django/views/generic/base.py\", line 89, in dispatch\n    return handler(request, *args, **kwargs)\n",
        "  File \"/home/user1/devel/pulp/server/pulp/server/webservices/views/decorators.py\", line 241, in _auth_decorator\n    return _verify_auth(self, operation, super_user_only, method, *args, **kwargs)\n",
        "  File \"/home/user1/devel/pulp/server/pulp/server/webservices/views/decorators.py\", line 195, in _verify_auth\n    value = method(self, *args, **kwargs)\n",
        "  File \"/home/user1/devel/pulp/server/pulp/server/webservices/views/repositories.py\", line 520, in get\n    self.manager.validate_importer(repo_id, importer_id)\n"
    ]
}