docs: def get_url_size(url):
      """Get the size of a URL.
  
      Note: Uses requests, so it does not work for FTP URLs.
  
      Source: StackOverflow user "Burhan Khalid".
      (http://stackoverflow.com/a/24585314/5651021)
  
      Parameters
      ----------
      url : str
          The URL.
  
      Returns
      -------
      int
          The size of the URL in bytes.
      """
      r = requests.head(url, headers={'Accept-Encoding': 'identity'})
      size = int(r.headers['content-length'])
      return size