exception-logging

I tried this solution with Elmah.XmlFileErrorLog but I'm getting following exception System.ArgumentNullException was unhandled by user code Message="Value cannot be null.\r\nParameter name: context" Source="Elmah" ParamName="context" StackTrace: at Elmah.ErrorSignal.FromContext(HttpContext context) in c:\builds\ELMAH\src\Elmah\ErrorSignal.cs:line 67 at Elmah.ErrorSignal.FromCurrentContext() in c:\builds\ELMAH\src\Elmah\ErrorSignal.cs:line 61 at ElmahHttpErrorHandler.ProvideFault(Exception error, MessageVersion version, Message& fault) in c:\Myapplication\App_Code\Util\ElmahHttpErrorHandler.cs

I'm using Elmah to log exceptions. Elmah is great at logging request bodies if the request is a Form-based request (i.e. Content-Type: application/x-www-form-urlencoded), but with JSON based requests where the content type is application/json, the request body is nowhere to be found in the error reports. Anyone know where I can find this request body so that I can properly diagnose my exceptions? UPDATE: 2012-01-03 As a clarification on what I mean by JSON based requests, here's an example raw HTTP request with JSON as the request body: PUT http://mycompany.com/api/v1.0/me HTTP/1.1 Host: