title: Get filename from url
body: <p>I am using file picker. File picker gives me a url like this after saving the file <code>https://www.filepicker.io/api/file/YVlnXammQium3ukD3Zf4</code></p>
  
  <p>But how do I know what the file name is? When I enter this URL in my browser I get the download tab and the tab shows me the <code>filename</code>. How can I get the file name using <code>javascript</code>? </p>
  
  <p>Is there another way to get the file name? I am using <code>Rails</code> as a backend and <code>Backbone</code> as the front end.</p>