Press ctrl + s in your browser, save files to your PC - modify links, upload to your domain.

NOTE:Pleass be aware that if the clone site gets indexed by google and the website owner see that you cloned his website you can get sued.

The best way to clone a site is to understand its functionality and develop it, with a custom template, and same functionality. This is what we do on our company.

Hope that helps.

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web development - php proxy script