Why is my url file on VPS change?

Posted October 1, 2013 2k views
I using CentOS 6, and I have some problem, Why is my url file on VPS change? For example: It's change: When I update new file index.css, the older file do not change. Thanks,

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Pagespeed adds a random string to each compiled file. won't change but a new "optimized" file will be created with a different name.