Ansible wait_for http

wait_for_http.yml

- name: wait_for http 
  command: "curl --silent {{ url }}"
  register: result
  until: result.stdout.find("200 OK") != -1
  retries: 60
  delay: 1
  changed_when: false

The dependency on httplib2 was removed in Ansible 2.1

And it can be run as a local action on the ansible-host, instead of the target host.
(Unless your network setup forbids ansible to reach the target url)

- name: Wait for frontend at {{ somewhere }} to come up
  local_action:
    module: uri
    url: "{{ somewhere }}"
    status_code: 200
  register: result
[...]