jQuery success callback called with empty response when WCF method throws an Exception

Question

I\'m tearing my hair out over this one, so bear with me (it\'s a long post).

Basic Info

• ASP.NET 3.5 with WCF service in ASP.NET compatibility mode

Answer 1

I had the same symptoms with a different scenario so this may or may not help.

Here is a breif summary of what I was doing and our solution:

I was posting to a REST implementation of a WCF service that we host from a classic ASP page. I found I had to set the input as a stream and read from that, disposing of the stream when done. I beleive it was at this point I was getting the 202 response with text of "success" as you have described. I discovered that by not disposing of the stream I was getting the response I was expecting for error conditions.

Here is a summary of the final code:

[WebHelp(Comment="Expects the following parameters in the post data:title ...etc")] 
    public int SaveBook(Stream stream)
    {
        NameValueCollection qString;
        StreamReader sr = null;
        string s;
        try
        {
            /**************************************************************************************
             * DO NOT CALL DISPOSE ON THE STREAMREADER OR STREAM                                  *
             * THIS WILL CAUSE THE ERROR HANDLER TO RETURN A PAGE STATUS OF 202 WITH NO CONTENT   *
             * IF THERE IS AN ERROR                                                               *

             * ***********************************************************************************/
            sr = new StreamReader(stream);
            s = sr.ReadToEnd();
            qString = HttpUtility.ParseQueryString(s);

            string title = qString["title"];

            //Do what we need

            //Then Return something
            int retRecieptNum = UtilitiesController.SubmitClientEntryRequest(entryReq);                

            return retRecieptNum;
        }
        catch (Exception ex)
        {
            throw new WebProtocolException(System.Net.HttpStatusCode.Forbidden, ex.Message, this.GetExceptionElement(true, "BookRequest", ex.Message), false, ex);
        }
        finally
        {

        }            
    }

Hopefully this is some help to you, maybe try using a stream and see how that goes.