Chrome loading script twice when manually typing url to move to next page

Question

I am having a bizarre issue that I\'m thinking may be a Chrome bug or possibly a bug with Visual Studio. My script is getting loaded twice. To verify the issue I created a test

Answer 1

Thanks so much to stdob for pointing me to the Live HTTP Headers extension. I'd recommend it if you are having a similar issue. https://chrome.google.com/webstore/detail/live-http-headers/iaiioopjkcekapmldfgbebdclcnpgnlo?hl=en

The issue in my case is with the Google Chrome prefetch optimization. When you type in the address bar, Google anticipates the page you will be loading and starts pulling down the scripts. If your script preforms some loading or cookie action upon loading this is problematic. When you uncheck this option you should see the duplicate loads go away.

However this is an easy way to control this without changing your settings. This is especially important since you have no control over your end-user's settings.

if (document.webkitVisibilityState && document.webkitVisibilityState == 'prerender') {
// avoid performing load logic
}

Answer 2

It's look like Chrome have non-obvious behavior when user manualy typing url in address bar. You can use some tools like Chrome live http headers to catch this behavior.