HttpModule not running with Visual Studio

Cassini, the development web server provided with IIS uses the IIS6 module syntax, so you must duplicate the module add like so

<system.web>  <httpModules>    <add name="MinimizeModule" type="ClipperHouse.UrlMinimizer.MinimizeModule" />  </httpModules></system.web><system.webServer>  <validation validateIntegratedModeConfiguration="false"/>  <modules>    <remove name="MinimizeModule" />    <add name="MinimizeModule" type="ClipperHouse.UrlMinimizer.MinimizeModule"          preCondition="managedHandler" />  </modules></system.webServer>

Note that I've also added a precondition to your IIS7 settings

If you are running on IIS 7, put the module in:

<configuration>   <system.webServer>      <modules>         <add name="MinimizeModule" type="ClipperHouse.UrlMinimizer.MinimizeModule" />      </modules>   </system.webServer></configuration>

If you are running on Cassini (Visual Studio's integrated miniature web-server), put the module in:

<configuration>   <system.web>      <httpModules>          <add name="MinimizeModule" type="ClipperHouse.UrlMinimizer.MinimizeModule" />   </system.web></configuration>

IIS will crash if you give it the Cassini location.
Cassini will crash if you give it the IIS location.

Whenever i deploy, i have to be sure not to deploy web.config. i also include the notes in web.config:

<system.web>   <!--The Cassini location to add modules (comment out for IIS)-->   <httpModules>      <!--WARNING: IIS will crash if you leave this in here.          IISBUG: IIS doesn't support system.web/httpModules,           and Cassini doesn't support system.webServer/modules      -->      <!--Comment out for IIS-->      <add name="PerformanceHttpModule" type="DummyPlaceholder.PerformanceHttpModule"/>   </httpModules></system.web><system.webServer>   <!--The IIS7 location to add modules (comment out for Cassini)   <modules runAllManagedModulesForAllRequests="true">      <!--IIS7 will crash if you present a system.web httpModules. -->      <remove name="PerformanceHttpModule" />      <add name="PerformanceHttpModule" type="DummyPlaceholder.PerformanceHttpModule"/>   </modules></system.webServer>

IIS's left hand doesn't know what Cassini's right hand is doing - and they both screwed it up.

Did you try also putting the module declaration in the element? When running in dev using Cassini, that's usually the place I have to put modules to get them running.