Call webservice from HTTP Delete method in ASP.NET Web API (IIS 6.0)

In my ASP.NET Web API I got this error when running HTTP Delete:

Failed to load resource: the server responded with a status of 501 (Not Implemented)

After making a wildcard mapping in IIS the HTTP Delete finally works fine (gallery image is correctly deleted ). This is how I made the mapping in IIS:

http://www.proworks.com/blog/2012/11/14/how-to-fix-aspnet-mvc-web-api-http-put-and-delete-requests-failing/

Each time I make a HTTP Post in my Web API I update/delete the cache at the Remote website by calling a webservice (.asmx). That works perfect. But, when I make a HTTP Delete the same webservice call don't work (Remote cache is not updated).

So, my question is:
Why is it not possible to call a external webservice from a HTTP Delete method?
LVL 1
webressursAsked:
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webressursConnect With a Mentor Author Commented:
This error was caused by a failure in the cache procedure (webservice).
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käµfm³d 👽Commented:
So you have a Web API action declared in your Web API controller that is decorated with the Delete attribute?

e.g.

public class YourController : ApiController
{
    // Some methods

    [HttpDelete]
    public ActionResult YourDeleteAction()
    {
        // some code
    }

    // Some more methods
}

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Dave BaldwinFixer of ProblemsCommented:
'HTTP Delete' is usually blocked to prevent people from deleting the files that make up your web site.  'Delete webservice.aspx' would be a request to delete your web service page.  http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol
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webressursAuthor Commented:
Problem solved by fixing the cache webservice.
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