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POWhy does a reverse proxy rewrite rule stop working when System.Web.Routing is active?
 

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  1. POWhy does a reverse proxy rewrite rule stop working when System.Web.Routing is active?
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    <p>Boiling this down to the simplest possible rule:</p> <pre><code> &lt;rule name="Reverse Proxy" stopProcessing="true"&gt; &lt;match url="^external/(.*)" /&gt; &lt;action type="Rewrite" url="http://some-site/{R:1}" /&gt; &lt;/rule&gt; </code></pre> <p>("Enable Proxy" is checked in the ARR Server Proxy settings at the server level).</p> <p>The above rewrite rule works fine in a very simple test app with a web.config containing the section, it works fine in a web forms app, but if I put the same rule into an MVC3 app (on the same machine, so identical config for IIS higher up) it never has any effect; the request flows through.</p> <p>if it's just a rewrite (and not a reverse proxy) it works OK, e.g.,</p> <pre><code> &lt;rule name="rewrite to internal" stopProcessing="true"&gt; &lt;match url="^internal/(.*)" /&gt; &lt;action type="Rewrite" url="different-internal/{R:1}" /&gt; &lt;/rule&gt; </code></pre> <p>...is fine.</p> <p>I can get the reverse proxy rule to work if I add </p> <pre><code> routes.IgnoreRoute("external/{*pathInfo}"); </code></pre> <p>in the Global.asax.cs class, so that my request for external/* doesn't hit the default controller, but I don't understand why. I think the URL rewrite module kicks in way before the Routing (see <a href="http://learn.iis.net/page.aspx/496/iis-url-rewriting-and-aspnet-routing/" rel="nofollow">http://learn.iis.net/page.aspx/496/iis-url-rewriting-and-aspnet-routing/</a>) so I'd expect there not to be a conflict between them.</p> <p>Is the Routing module adding in "virtual" rewrite rules to the URL rewrite module, that are overriding my declared rewrite rules?</p>
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    1. USTom Crane
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