diff --git a/index.html b/index.html
index f088a91ac9..7fe77016f1 100644
--- a/index.html
+++ b/index.html
@@ -30,7 +30,41 @@
window.onload = function() {
document.body.innerHTML
= "The application failed to load, missing file: "
- + fileRef;
+ + fileRef;
+
+ // The whole complex part below implements page reloads with
+ // "exponential backoff". The retry attempt is passes as
+ // "rCounter" query parameter
+ var href = window.location.href;
+
+ var retryMatch = href.match(/.+(\?|&)rCounter=(\d+)/);
+ var retryCountStr = retryMatch ? retryMatch[2] : "0";
+ var retryCount = Number.parseInt(retryCountStr);
+
+ if (retryMatch == null) {
+ var separator = href.indexOf("?") === -1 ? "?" : "&";
+ var hashIdx = href.indexOf("#");
+
+ if (hashIdx === -1) {
+ href += separator + "rCounter=1";
+ } else {
+ var hashPart = href.substr(hashIdx);
+
+ href = href.substr(0, hashIdx)
+ + separator + "rCounter=1" + hashPart;
+ }
+ } else {
+ var separator = retryMatch[1];
+
+ href = href.replace(
+ /(\?|&)rCounter=(\d+)/,
+ separator + "rCounter=" + (retryCount + 1));
+ }
+
+ var delay = Math.pow(2, retryCount) * 2000;
+
+ window.setTimeout(
+ function () { window.location.replace(href); }, delay);
};
window.removeEventListener(
'error', loadErrHandler, true /* capture phase */);