Embed website inside a website(Without Iframe)

Hi Everyone,

I want to embed website inside a website. Due to X-Frame Options header, some websites(like amazon.in) avoid iframe. But those websites work fine on Proxy Sites(I suppose they are framing website inside website).
I want to know how proxy websites(Like Kproxy.com) are embedding websites when the url is entered.

Please help. I will be very thankful to you.