René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"System test for 'Topic.check_iam_permissions' fails with 503","articleBody":"While working on a new system test for `Topic.check_iam_permissions` (the wrapper for `projects.topics.testIamPermissions`), the back-end consistently fails the API call with a 503::\n\n``` python\n(Pdb) pp content\n'{\\n  \"error\": {\\n    \"code\": 503,\\n    \"message\": \"The service was unable to fulfill your request. Please try again. [code=8a75]\",\\n    \"status\": \"UNAVAILABLE\"\\n  }\\n}\\n'\n(Pdb) pp response\n{'-content-encoding': 'gzip',\n 'alt-svc': 'quic=\":443\"; ma=2592000; v=\"32,31,30,29,28,27,26,25\"',\n 'alternate-protocol': '443:quic',\n 'cache-control': 'private',\n 'content-length': '162',\n 'content-type': 'application/json; charset=UTF-8',\n 'date': 'Fri, 01 Apr 2016 16:20:35 GMT',\n 'server': 'ESF',\n 'status': '503',\n 'transfer-encoding': 'chunked',\n 'vary': 'Origin, X-Origin, Referer',\n 'x-content-type-options': 'nosniff',\n 'x-frame-options': 'SAMEORIGIN',\n 'x-xss-protection': '1; mode=block'}\n(Pdb) pp method\n'POST'\n(Pdb) pp url\n'https://pubsub.googleapis.com/v1/projects/citric-celerity-697/topics/ex_topic_iam_policy-1459527567594:testIamPermissions'\n```\n\n@tmatsuo does that extra code (`8a75`) tell you anything about the failure?\n","author":{"url":"https://github.com/tseaver","@type":"Person","name":"tseaver"},"datePublished":"2016-04-01T16:26:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/1687/google-cloud-python/issues/1687"}