Redirect Non-WWW to WWW in Web.config (Except one spesific subdomain)

On my Windows 2012 server I have installed the URL Rewrite module in IIS. I have followed this guide to redirect non-www to www in web.config: http://www.surfingsuccess.com/asp/iis-url-rewrite.html#.VF6GBid0yAU

So far, so good!

The only problem is that we also host the subdomain "api.mysite.com". This API stops working when I apply the <rewrite> code in web.config. My question is: How can I change the <rewrite> code below to redirect non-www to www, except for the subdomain "api.mysite.com"? 

    <rewrite>
      <rules>
        <rule name="RedirectToWWW" stopProcessing="true">
          <match url=".*" ignoreCase="true" />
          <conditions>
            <add input="{HTTP_HOST}" pattern="^mysite.com$" />
          </conditions>
          <action type="Redirect" url="http://www.mysite.com/{R:0}" redirectType="Permanent" />
        </rule>
      </rules>
    </rewrite>

Open in new window

LVL 1
webressursAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Shaun KlineLead Software EngineerCommented:
Could you add a new rule as the first rule matching the specific URL in question and use the action type of None?
webressursAuthor Commented:
I don't know? I guess it should be possible to make an exception so that "api.mysite.com" never is redirected. I tried using "negate" in <conditions>, then "api.mysite.com" worked as it should, but mysite.com is not always correct redirected to www.mysite.com.
webressursAuthor Commented:
Do you mean something like this?

<rule name="block" stopProcessing="true">
    <match url="^api.mysite.com$" />
    <action type="None" />
</rule>

Open in new window

10 Holiday Gifts Perfect for Your Favorite Geeks

Still have some holiday shopping to do for the geeks in your life? While toys, clothing, games, and gift cards are still viable options for your friends and family, there’s more reason than ever to consider gadgets and software.

LEARN MORE
Shaun KlineLead Software EngineerCommented:
That appears to be correct, based on Microsoft's documentation.
webressursAuthor Commented:
I tried it, but the subdomain does not work.

    <rewrite>
      <rules>
        <rule name="RedirectToWWW" stopProcessing="true">
          <match url=".*" ignoreCase="true" />
          <conditions>
            <add input="{HTTP_HOST}" pattern="^mysite.com$" />
          </conditions>
          <action type="Redirect" url="http://www.mysite.com/{R:0}" redirectType="Permanent" />
        </rule>
        <rule name="API" stopProcessing="true">
          <match url="^api.mysite.com$" ignoreCase="true" />
          <action type="None" />
        </rule>
      </rules>
    </rewrite>

Open in new window

webressursAuthor Commented:
I also tried "negate" without Luck

    <rewrite>
      <rules>
        <rule name="RedirectToWWW" stopProcessing="true">
          <match url=".*" ignoreCase="true" />
          <conditions>
            <add input="{HTTP_HOST}" pattern="^mysite.com$" />
            <add input="{HTTP_HOST}" pattern="^api.mysite.com$" negate="true" />
          </conditions>
          <action type="Redirect" url="http://www.mysite.com/{R:0}" redirectType="Permanent" />
        </rule>
      </rules>
    </rewrite>

Open in new window

Shaun KlineLead Software EngineerCommented:
Retry the first attempt, but switch the order of the rules. I believe the rules engine will find the first rule that satisfies the condition, and in your first attempt, the .* would match anything and, therefore, would always be used.
Vivek ReddyCommented:
<rule name="Redirect to HTTPS" stopProcessing="true">
<match url="(.*)" />
<conditions><add input="{HTTPS}" pattern="^OFF$" />
</conditions>
<action type="Redirect" url="https://{HTTP_HOST}/{R:1}" redirectType="SeeOther" />
</rule>
webressursAuthor Commented:
Shaun Kline: Unfortunatly that did not help either, api.mysite.com still stop working when I add the <rewrite> code in web.config (mysite.com).

I think this is pretty strange since api.mysite.com is one site in IIS, and mysite.com is another site in IIS. When I user url rewrite on one site (mysite.com), why does that effect another site (api.mysite.com). They also run in separate application pools.
webressursAuthor Commented:
Is it possible to make a rule that only redirects to www.example.com if the input doesn't start with www. or api.?
webressursAuthor Commented:
Actually, there was nothing wrong with my rewrite code. The reason why the API stopped working was because it had a referance to the top domain of the site (example.com), this caused a conflict with the rewrite code. After changing the referance to the www -version of the doman (www.example.com) everything worked fine.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
webressursAuthor Commented:
This solved the problem.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft IIS Web Server

From novice to tech pro — start learning today.