Never cache user agent(s)

The option is used to prevent cached and optimized pages from being served on certain devices and in certain browsers.

The User-Agent request header is a string that lets servers identify the operating system, vendor, and/or version of the browser that accesses a page.

You can exclude certain User-Agents from being served cache by adding the string value in the Never Cache User Agent(s) text area in the Advanced Rules tab:

User-Agent containing Mobile/15E148 Safari/604.1 string can be added as:


Exclude a specific browser, as in the example:


Add a device name, as in the example:


Wrong display on tablet

Please see the article for possible solutions: 

Wrong display for mobile, tablet or desktop

Additional resources:

Heads up! Some exclusions added here can disable caching for almost all browsers; e.g. (.*)Safari(.*) will match any browser that includes "Safari" in the user agent.

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