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[OpenStack Infra <1775047@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: master
Review: https://review.openstack.org/572179

** Changed in: python-jenkins
       Status: New => In Progress

** Changed in: python-jenkins
     Assignee: (unassigned) => Dennis Dmitriev (ddmitriev)

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https://bugs.launchpad.net/bugs/1775047

Title:
  build_job() is failing with "... empty response" exception when
  Jenkins is behind haproxy where disabled keep_alive

Status in Python Jenkins:
  In Progress

Bug description:
  Jenkins supports keep_alive http option, and when
  JenkinsClient:build_job() is called, normally the response contains
  the 'content-length' header, for example:

    ipdb> response.status_code
    201
    ipdb> response.headers
    {'Date': 'Mon, 04 Jun 2018 11:52:00 GMT', 'Content-Length': '0', 'Location': 'http://10.70.0.15:8081/queue/item/11/', 'X-Content-Type-Options': 'nosniff', 'Server': 'Jetty(9.4.z-SNAPSHOT)'}

  But if Jenkins master is behind HAProxy with enabled 'option
  httpclose', which disables keep_alive, the response doesn't contain
  'content-length' header:

    ipdb> response.status_code
    201
    ipdb> response.headers
    {'Date': 'Mon, 04 Jun 2018 11:55:36 GMT', 'Connection': 'close', 'Location': 'http://10.60.0.90:8081/queue/item/16/', 'X-Content-Type-Options': 'nosniff', 'Server': 'Jetty(9.4.z-SNAPSHOT)'}

  Other fields that are checked in JenkisClient:_response_handler() are empty in both cases:
    ipdb> response.content
    ''
    ipdb> response.text
    u''

  As the result: JenkinsClient raises an exception like:

    File ".../local/lib/python2.7/site-packages/jenkins/__init__.py", line 1280, in build_job
      'POST', self.build_job_url(name, parameters, token)))
    File ".../lib/python2.7/site-packages/jenkins/__init__.py", line 565, in jenkins_request
      self._request(req))
    File ".../lib/python2.7/site-packages/jenkins/__init__.py", line 523, in _response_handler
      "empty response" % self.server)
  jenkins.EmptyResponseException: Error communicating with server[http://10.60.0.90:8081/]: empty response

  However, the response is valid because the meaningful part of the
  response is the header 'Location'.

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