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

webressurs
webressurs used Ask the Experts™
on
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

Comment
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
Shaun KlineLead Software Engineer

Commented:
Could you add a new rule as the first rule matching the specific URL in question and use the action type of None?

Author

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.

Author

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

Exploring SharePoint 2016

Explore SharePoint 2016, the web-based, collaborative platform that integrates with Microsoft Office to provide intranets, secure document management, and collaboration so you can develop your online and offline capabilities.

Shaun KlineLead Software Engineer

Commented:
That appears to be correct, based on Microsoft's documentation.

Author

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

Author

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 Engineer

Commented:
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.
<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>

Author

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.

Author

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.?
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.

Author

Commented:
This solved the problem.

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial