This sounds like what #3147 was intended to address, but it's apparently not working:

Traceback (most recent call last):
  File "./myg_runs.py", line 244, in <module>
    main()
  File "./myg_runs.py", line 230, in main
    dump_subprojects(stats, project, SKIP_PROJECTS)
  File "./myg_runs.py", line 210, in dump_subprojects
    dump_pipeline_instances(stats, sp)
  File "./myg_runs.py", line 182, in dump_pipeline_instances
    time = dump_pipeline_instance(stats, i)
  File "./myg_runs.py", line 167, in dump_pipeline_instance
    dump_jobs(batchid, sample, cwl_runner['job']['components'])
  File "./myg_runs.py", line 84, in dump_jobs
    jobs = api.jobs().list(filters=[['uuid','=',job_uuid]]).execute()
  File "/usr/lib/python2.7/dist-packages/oauth2client/util.py", line 140, in positional_wrapper
    return wrapped(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/googleapiclient/http.py", line 840, in execute
    raise HttpError(resp, content, uri=self.uri)
arvados.errors.ApiError: <HttpError 502 when requesting https://e51c5.arvadosapi.com/arvados/v1/jobs?alt=json&filters=%5B%5B%22uuid%22%2C+%22%3D%22%2C+%22e51c5-8i9sb-b8od8nvombxq3h3%22%5D%5D returned "Bad Gateway">