IIS Check whether a URL contains www

[dukelips]

is there any other way to check whether a url is having www or not.(except javascript)

[phranque]

you can check the presence or absence of "www" in a string in any language that supports regular expressions.
if you are looking for a method to check the url of the current page in the user agent, you could probably use java or flash as well as javascript.

[dukelips]

We are using asp, is there any other way to automatically add www to a url.
For eg:
example.com - www.example.com

[JohnRoy]

Once the page is displayed, you cannot just "add" the www.
The (non www) page needs to then be redirected (301) to the www.page

if Request.ServerVariables("server_name")="example.com" then 
Redirect301 = www.example.com/page_path_and_name 
end if 

[phranque]

you don't want to do this "on the page" or in the user agent.
the correct way to do this is in the server with a "Moved Permanently" (301) response as JohnRoy suggested.
this is called "domain canonicalization [google.com]" and there are several methods for doing this on an ASP server.

[dukelips]

what will happen to the pages inside the directories after the redirect

[dukelips]

I just selected the third option "redirect to a url" in iis and it works fine.

Phranque & John , my heartfelt thanks for ur help.

We have a got a ssl for a domain www.example.com and we dint people to access directories through sub domains.

[phranque]

make sure to also check the box for "A permanent redirection for this resource" so that it properly sends a 301 response code.

[marcel]

If there are deep-links from other sites to the non-www version of your site that you cannot edit, you can use the following syntax in the 'redirect to a URL' textbox:

http://www.example.com$S$Q

This will pass the subdirectory and querystring to the new domain.

Here is a list of other options from Microsoft Technet [microsoft.com]

[dukelips]

We use IIS 5 and is it similiar for both 5 and 6