Handling Errors (i.e. Content Length) Within an HttpHandler

I'm working on an uploader built with an HttpHandler. I would like to create a routine to handle all uncaught errors including content length error.

<%@ webhandler class="MyNamespace.UploadHandler" %>

Namespace MyNamespace

Class UploadHandler

  Implements IHttpHandler

  ReadOnly Property IsReusable As Boolean Implements IHttpHandler.IsReusable
    Get
      Return False
    End Get
  End Property

  Sub Page_Error(sende开发者_StackOverflowr As Object,e As EventArgs)

    ' Never fires

  End Sub

  Sub ProcessRequest(context As HttpContext) Implements IHttpHandler.ProcessRequest

  ...

  End Sub

End Class

End Namespace

It's critical that I handle any 404.13 (request exceeds request content length) error in the httphandler itself.

I would also like Page_Error to handle any uncaught exceptions but it never fires.

Apparently this just cannot be done. From scouring the net, it seems that the only possible place to catch the 404.13 error is in Application_BeginRequest. I don't think that's going to work for my purposes but maybe it will help someone else. I'll be handling the error from the JavaScript side.

As to Page_Error - that's not part of HttpHandler so the only solution is a try/catch block around the work done in ProcessRequest.