Server behaviour{set a permanent (HTTP 301)}, Duplicate content found at site with and without the www Options

[khulibaatadmin]

I am a newbie with very little knowledge and have made this website http://www.***.com. It is a Chat Site.

I was just willing to analyze my site and went to a website http://nibbler.silktide.com/

I analyzed my site and there was one thing which I want to be fixed and can't find any easy to understand information on internet and could not find any relevant info at the hosting provider's site.

This is the link of my site analysis:-

http://nibbler.silktide.com/reports/***.com


What I want to be corrected is Server Behaviour.


What they have mentioned in their report goes like this. I am doing a copy paste of their report.

"Server behaviour

Help

Duplicate content found at site with and without the www

This website does not return a 404 error HTTP status code for missing pages. This is bad because search engines like Google might mistake this for a real page of content.
Ensure your web server returns a 404 HTTP status code for error pages.
This website was not served using GZIP encoding. GZIP compression is widely supported and reduces the load time of a web page.
Enable GZIP compression on your web server or in your application. Close detail
Pages without GZIP
Page
***.com/
***.com/rules.html
***.com/contact.html
1
This website returns page content with or without a trailing slash on the URLs. Search engines might see these as separate pages with duplicate content which they could penalise for.
Use a 301 redirect or a canonical meta tag to force search engines to see the correct version. Close detail
Duplicate pages
Tested page

Alternate
***.com/rules.html

***.com/rules.html/
***.com/contact.html

***.com/contact.html/
1
There is duplicate content on http://www.***.com and http://***.com. This is bad, as technically they are classed as two different websites. Search engines may lower a website's rank if they find the same content on two different URLs.
Choose one domain that you would like to use and then set a permanent (HTTP 301) redirect to forward users who visit the other."





Somebody please tell me how can this issue be fixed as according to them this might lower down my search engine ranking (though currently I don't have any

Or else please provide links to the information which is easy to understand for a newbie.

Thanks in advance.

This post has been edited by Christian J: Apr 28 2013, 05:25 PM

[khulibaatadmin]

test post