Content caching can be incredibly useful for any webmaster, because it can improve overall performance by using fewer resources over time. But if you’re monitoring a website or service, caching can make it difficult to know whether an element is truly up or down.

By inserting a random URL value, you can bust the cache for any HTTP, Web Service, RBC, or FPC call, and ensure that no previous content is cached.

Note: the following information is about server side caching on your side, not on the side of the Uptrends' website monitoring service.

How does Cache Busting work?

Cache busting is made possible by using the {random} token. To use this feature, simply enter the token as part of the URL in the monitor settings, for example:

http://www.example.com?myvalue={random}

Which gets resolved as something like:

http://www.example.com?myvalue=37f1f109-58a2-4bea-adfb-9aed54619453
Note: entering the {random} token also works in HTTP POST request body.