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Cachebuster – A Pro Tip for Bypassing Cache.

Written by Tomas Koprusak 181 words | 1 min read Updated Nov 13, 2025
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Caching is a great way to improve website performance and minimize the load.

An ideal cache displays the cached version until the content changes and flushes the cache when there is a change. Yet, there may be cases where the cached version is not the most up-to-date one (if there is a DB error on the site or the caching is only time-based..).

And, we may want Uptime Robot to load the non-cached version on each request to make sure that the uptime/downtime is decided accordingly.

Here is a tiny feature (a pro tip) that can help bypassing cache.

Cachebuster

Uptime Robot will auto-replace the string:

  • *cachebuster*

in the querystring with a unique timestamp every time so that each request is unique.

As an example, if the website to be monitored is:

  • https://mywebsitetomonitor.com

We can use the URL as:

  • https://mywebsitetomonitor.com/?*cachebuster*

and the request will have a different querystring each time.

Hope this helps for a better uptime.

Update (2019-11-19): The feature can now be used for custom HTTP headers and POST values as well.

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Tomas Koprusak

Written by

Tomas Koprusak

Product Owner |

He has worked for Sygic as a marketer and co-led the implementation and development of a product acquired from a competitor. He has also worked as a freelance developer, helping clients from various areas. Tomas brings a wealth of industry experience to our team. He spent a few years in the blockchain industry, leading projects and marketing teams at multiple blockchain-based companies. He has presented products and managed deals in more than 10 countries around the world, managed the ICO, and built a successful marketing team at Fuergy that continues to thrive. Tomas managed a product team for the biggest job site in Slovakia, covering development and transformation to a new B2B app. Not only is Tomas skilled at web development, but he also has a deep understanding of SaaS businesses, which makes him an invaluable asset in shaping and leading various projects at UptimeRobot. His focus is always on the continual improvement of our service and user experience. In addition to his professional achievements, Tomas is a devoted father. His personal interests include cycling (he traveled around the whole country of Slovakia), playing guitar (he even played in a band), servicing bikes, music, and enjoying good beer.

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