title: How to provide external url to docker image
body: <p>I am working on Docker Image, I am a beginner on Docker.
  I have one Docker Image, but what I want to update my Docker Image as that my Docker Image should accept the one external URL like:- and 
  start the further processing on it.</p>
  
  <p>I do not have any clue how to do this, I am totally new on Docker and have only basic understanding of Docker.</p>