code: public static String getURLString(String relativeToBase){
          if(relativeToBase.startsWith("/")){
              relativeToBase = relativeToBase.substring(1);
          }
          return baseURL + relativeToBase;
      }
docs: Get the URL relative to the base URL as a String.<br>
  For example, if baseURL is "http://blob.deeplearning4j.org/", and relativeToBase is "/datasets/iris.dat"
  this simply returns "http://blob.deeplearning4j.org/datasets/iris.dat"
  
  @param relativeToBase Relative URL
  @return URL
  @throws MalformedURLException For bad URL