Request partial byte range of png using 206 partial content request

request_image_byte_range.js

// PNG file structure
// taken from: http://www.w3.org/TR/REC-png-961001#Structure

var xhr = new XMLHttpRequest;

xhr.onreadystatechange = function () {
  if (xhr.readyState != 4) {
    return;
  }
  debugger;
  console.log(xhr); // xhr.response (the byte range of the png)
};

xhr.open('GET', 'http://pngimg.com/upload/dog_PNG161.png', true);
xhr.setRequestHeader('Range', 'bytes=100-200');
xhr.send(null);