returning status 400 with error messages

[Phil Cruz]

I'm using taffy and I have an api call where if a required parameter is not provided I want to return an error message with a 400 status code. i.e. 

if (not len(trim(arguments.serialNumber)) )

{

     result["errorMessage"] = "Serial number was not provided";

     return representationOf(result).withStatus(400);

}

The problem is in IIS7 I have custom error pages enabled so that I can display a custom 404 pages. Apparently this is interfering with the 400 error. When the API call is made and a 400 is returned, the response simply contains "bad request". If I disable custom errors 

http://screencast.com/t/8BmUW59QrC 

How can I set this up so both work?

-Phil

[Phil Cruz]

Of course, right after I post this I find the solution

http://www.lamoree.com/machblog/index.cfm?event=showEntry&entryId=49B1EA02-4EBD-49F3-9AB2B5432E4E1F28 

so in web.config I have

<httpErrors errorMode="Custom" existingResponse="PassThrough">

            <remove statusCode="404" subStatusCode="-1" />

            <error statusCode="404" prefixLanguageFilePath="" path="/apps/index.cfm?action=error.404" responseMode="ExecuteURL" />

</httpErrors>

-Phil