How can I get an absolute URL instead of a relative one? [closed]

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I use this code to give my images link, but this code gives me a relative URL

MY Simplified 开发者_如何学GoCode :

<a href="www.google.com"><img src="/upload/banner.jpg" width="374" height="60"></a>

how can I give an exact link?

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Use a protocol:

http://www.google.com/

The minimum required to make it domain-absolute is this:

//www.google.com/

which will use the same protocol as the current page (e.g. http or https).