code: public static String getFormatNameFromHttpImage(final String sourceImageHttpURL)
              throws IOException {
  
          ImageReader imageReaderFromHttpImage = getImageReaderFromHttpImage(sourceImageHttpURL);
          return imageReaderFromHttpImage != null ? imageReaderFromHttpImage.getFormatName() : null;
      }
docs: Returns a String identifying the format of given web image.<br>
  e.g: image source is "<span style='color:blue'>example.png</span>" then
  return "<span style='color:blue'>png</span>". Even the name just is
  "<span style='color:blue'>example</span>", we can handle it if this is an
  image.
  
  @param sourceImageHttpURL
  the web image url which you want to handle.
  @return the format name of given image.
  @throws IOException