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:

Mobile(.*)Safari(.*)

Exclude a specific browser as in the example:

(.*)Firefox(.*)

Add a device name as in the example:

iPad
NexusTablet

Wrong display on tablet

Please see the article for possible solutions: 

Wrong Display for Mobile, Tablet or Desktop

Additional resources:

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