asked on 11/8/2014

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

Microsoft IIS Web Server ASP.NET

Last Comment

webressurs

11/25/2014

Shaun Kline

11/9/2014

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

webressurs

11/9/2014

ASKER

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.

webressurs

11/9/2014

ASKER

Do you mean something like this?

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

Open in new window

Shaun Kline

11/10/2014

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

webressurs

11/12/2014

ASKER

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

webressurs

11/12/2014

ASKER

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 Kline

11/12/2014

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 Reddy

11/13/2014

webressurs

11/13/2014

ASKER

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.

webressurs

11/13/2014

ASKER

Is it possible to make a rule that only redirects to www.example.com if the input doesn't start with www. or api.?

ASKER CERTIFIED SOLUTION

webressurs

11/21/2014