title: HTTP verb POST used to access path '/' is not allowed in Facebook app
body: <p>I'm trying to build simple facebook application with 4.2.1 C# SDK. But I have an error:</p>
  
  <pre><code>The HTTP verb POST used to access path '/' is not allowed.
  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
  
  Exception Details: System.Web.HttpException: The HTTP verb POST used to access path '/' is not allowed.
  
  Source Error:
  
  An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
  
  Stack Trace:
  
  [HttpException (0x80004005): The HTTP verb POST used to access path '/' is not allowed.]
     System.Web.DefaultHttpHandler.BeginProcessRequest(HttpContext context, AsyncCallback callback, Object state) +2488621
     System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8841400
     System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +184
  
  Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1 
  </code></pre>
  
  <p>I'm using Web.config from <a href="https://stackoverflow.com/questions/4596890/facebook-c-sdk-sample-code">this SO Q&amp;A</a>.</p>