This article relates to LoadMaster firmware version 7.2.51.
As of LoadMaster firmware version 7.2.51, you can assign URL modification rules to a response. First, create the relevant Modify URL rule in Rules & Checking > Content Rules if using the LoadMaster Web User Interface (WUI). Then, in the modify Virtual Service screen, click Show Header Rules in the Advanced Properties section. In the Response Rules section, add the relevant Modify Response rule.
For further details on content rules in general, refer to the Long Term Support (LTS) Content Rules Feature Description document.