Hey @Reshma, You can use the URI Module for this purpose. This module interacts with http and https servers supports many authentication mechanism.  
Try something like this:
tasks:
- name: post to consul
  uri:
    url: http://marathon.service.consul:8080/v2/apps/
    method: POST
    body: "{{ lookup('file','mesos-consul.json') }}"
    body_format: json
    headers:
      Content-Type: "application/json"