One of few legacy leftovers that was never dropped over the years is the common use of www domain prefix. It is not a problem per se for us humans, but SE bots have mind of their own. When traversing a non-www and a www version of a web site, apparently, google and other bots are treating them as two separate web entities, even if content is identical.
This causes confusion in SE databases and in a worst case a drop from the index.
To avoid this confusion, web site operators should redirect their non-www traffic to www version of the website, or redirect the www version to the non-www version of the site.
This should be done using 301 redirect, i.e. when request for http://example.com is made, the web server would return
HTTP/1.1 301 Moved Permanently
Location: http://www.example.com/
response with the location of the new site.
So how can I do this in IIS 7? Well, you have to edit web.config file, modify or add
the following section to its rewrite section.
This should be your first rule.
The rewite section should be placed in system.webServer section.
Then just refresh your site and voila you have all trafic to http://example.com/* redirected to http://www.example.com/*
This causes confusion in SE databases and in a worst case a drop from the index.
To avoid this confusion, web site operators should redirect their non-www traffic to www version of the website, or redirect the www version to the non-www version of the site.
This should be done using 301 redirect, i.e. when request for http://example.com is made, the web server would return
HTTP/1.1 301 Moved Permanently
Location: http://www.example.com/
response with the location of the new site.
So how can I do this in IIS 7? Well, you have to edit web.config file, modify or add
the following section to its rewrite section.
<rewrite>
<rules>
<rule name="non www to www" enabled="true">
<match url="(.*)" />
<conditions>
<add input="{HTTP_HOST}" negate="true" pattern="^www\.([.a-zA-Z0-9]+)$" />
</conditions>
<action type="Redirect" url="<a href="http://www.{HTTP_HOST}/{R:0"
>http://www.{HTTP_HOST}/{R:0</a>}" appendQueryString="true" redirectType="Permanent" />
</rule>
</rules>
</rewrite> The rewite section should be placed in system.webServer section.
Then just refresh your site and voila you have all trafic to http://example.com/* redirected to http://www.example.com/*
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