title: AWS S3 Same Image, Different Sizes
body: <p>When a user uploads an image to my site, I save multiple copies of the image in different sizes to S3. Is it possible to save one copy of the image and access the different sizes with URL variables?</p>
  
  <p>I would prefer something like this:</p>
  
  <pre><code>https://s3-us-west-2.amazonaws.com/img.jpg?size=small
  https://s3-us-west-2.amazonaws.com/img.jpg?size=medium
  https://s3-us-west-2.amazonaws.com/img.jpg?size=large
  </code></pre>
  
  <p>As opposed to this:</p>
  
  <pre><code>https://s3-us-west-2.amazonaws.com/img1.jpg
  https://s3-us-west-2.amazonaws.com/img2.jpg
  https://s3-us-west-2.amazonaws.com/img3.jpg
  </code></pre>
  
  <p>I do not want to download large images unnecessarily.</p>