app-link-route.js

var UA = navigator.userAgent;
if (UA.match('Android') && !UA.match('Kindle')) {
  tryIframeApproach(data.app_link, data.store_link.android);
}
else if (UA.match('iPhone|iPad|iPod')) {
  tryIframeApproach(data.app_link, data.store_link.ios);
}
else {
  location.href = data.web_link;  
}

/**
 * The Usual Trick
 */
function tryIframeApproach (app_url, fallback_url) {
  var iframe = document.createElement("iframe");
  iframe.style.border = "none";
  iframe.style.width = "1px";
  iframe.style.height = "1px";
  iframe.onload = function () {
    document.location = fallback_url;
  };
  iframe.onerror = function () {
    document.location = fallback_url;
  };
  iframe.src = app_url;
  document.body.appendChild(iframe);
}