code: private String getRequestUrl(String line) {
      int end = line.length() - 2;
      while (line.charAt(end) != ' ') {
        end--;
      }
  
      int start = end - 1;
      while (line.charAt(start) != ' ') {
        start--;
      }
      return line.substring(start + 1, end);
    }
docs: Returns the request URL.