asp.net mvc - WebAPI Delete not working - 405 Method Not Allowed

Question

I appreciate any help on this as the site is supposed to go live tonight!

I have a web api controller with a Delete method. The method executes fine on my local machine running IIS Express (Windows 8) but as soon as I deployed it to the live IIS server (Windows Server 2008 R2) it stopped working and throws the following error message:

HTTP Error 405.0 - Method Not Allowed The page you are looking for cannot be displayed because an invalid method (HTTP Verb) is being used

I have looked around the web for solutions and I implemented most reasonable ones. My web config has the following settings:

<system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
<handlers>
    <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
    <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
    <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
    <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%Microsoft.NETFrameworkv4.0.30319aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
    <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%Microsoft.NETFramework64v4.0.30319aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
    <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>
</system.webServer>

I have also tried to change the Handler Mappings and Request Filtering in IIS to no avail. Please note that the WebDAV Authoring Rules in IIS seems to be disabled.

Any ideas will be greatly appreciated Thanks.

Answer 1

I found the solution eventually! If you come across the same issue, add the following to your web.config

<system.webServer>
    <validation validateIntegratedModeConfiguration="false"/>
    <modules runAllManagedModulesForAllRequests="true">
        <remove name="WebDAVModule"/> <!-- ADD THIS -->
    </modules>
    ... rest of settings here

I hope this helps