Magento localhost installation Invalid Base URL

I was installing magento on localhost so i can test different magento extensions. But on configuration page I was getting error for base url as below:

The URL "http://www.magento.ag.com/" is invalid.
Response from server isn't valid.

The URL "http://www.magento.local/" is invalid.
Response from server isn't valid.

The URL "http://localhost/" is invalid.
Response from server isn't valid.

Note: I was trying with different urls but all failed. At last found one solution.

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Magento commerce reference and backup posts, installation points.

Magento commerce reference and backup posts, installation points.

Since i started to work with magento e-commerce, i have lost few kilos. Probably this is good weight loss program for me.

From today onward i want to keep backup of the steps, references etc to my blog. I hope this will make me easy to find them easily next time.

Some of the code helpful to change permission on files and folders while upgrading magento through connect manager.

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