When should one set UseCanonicalName = On ?

I've been running with it off for a long time, I think because
I ran into problems with HTTP_HOST returning empty strings. I'm
not sure why I turned it off, but it's been that way for over a
year now. And I've been verifying against SERVER_NAME rather than
HTTP_HOST to get rid of companies that iframe websites.

I noticed that when it's turned on, SERVER_NAME returns

www.example.com

whereas, SERVER_NAME returns

example.com

when it's turned off.

--
Jim Carlock
You Have More Than Five Senses
http://www.associatedcontent.com/art...ve_senses.html

Jim Carlock wrote:

> When should one set UseCanonicalName = On ?
>
> I've been running with it off for a long time, I think because
> I ran into problems with HTTP_HOST returning empty strings. I'm
> not sure why I turned it off, but it's been that way for over a
> year now. And I've been verifying against SERVER_NAME rather than
> HTTP_HOST to get rid of companies that iframe websites.
>
> I noticed that when it's turned on, SERVER_NAME returns
>
> www.example.com
>
> whereas, SERVER_NAME returns
>
> example.com
>
> when it's turned off.
>

This URL explains it probably better than anyone could try themselves:

http://www.apacheref.com/ref/http_co...nicalName.html

Also, see:

http://httpd.apache.org/docs/2.2/mod...ecanonicalname


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