Web Service .asmx returns null

[Timothy]

Running VS2010 (SP1) using the latest Telerix Q3 2011 controls, ASP.NET version 4, AjaxControltoolkit version 4 on a Windows 2008 R2 installation.
I am using a web service:-
   [ScriptService]
   [WebService(Namespace = "http://tempuri.org/")]
   [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
   public class PS_AdminWebInterface : System.Web.Services.WebService
   {
      [WebMethod(EnableSession = true)]
      public string[] GetSessionString(string sessionKey)
      {
         string[] results = new string[2];
         results[0] = sessionKey;
         try
         {
            if (Session["ClientID"].ToString() == "0")            //Logged in users only
            {
               results[1] = "";
               Session["ErrorOccurred"] = true;
            }
            else if (Session[sessionKey] == null)       //Does key exist
            {
               results[1] = "";
               Session["ErrorOccurred"] = true;
            }
            else
               results[1] = Session[sessionKey].ToString();
         }
         catch
         {
            results[1] = "";
         }
         return results;
      }
}

I have debugged the web service call and it is definitely being called and no exception is raised - however the javascript call :-
PlumSoftware.PS_AdminWebInterface.GetSessionString(ps_interface_sessionKey, GetSessionString, OnTimeOut, OnServiceError);

fails in the following function:-
function GetSessionString(result)
{
   if (result[1] != "0")
   {          //Data changed
      ps_interface_keepalive = 0; //Reset keepalive
      __doPostBack(ps_interface_postbackcontrol.value, result[1]);
   }
}

the result returned is always null

I have spent a few hours looking through your forums but have found no clues as to why this would be happening.

[Veli]

Hi Timothy,

The code you provided seems OK and I cannot spot what might be the issue here. If you can open a support ticket and submit a sample project demonstrating this issue, our support staff will be happy to look into this.

Veli
the Telerik team

[Timothy]

Hi - fired up Ie9 developer tools to have a peek a what was being sent back from the web service. In the production environment the response body looks like :-
{"d":["ChargeDataChanged","0"]}
in the development environment where I am testing the Telerik framework it comes back as :-
‹      ì½`I–%&/mÊ{JõJ×àt¡€`$ؐ@ìÁˆÍæ’ìiG#)«*ÊeVe]f@Ì흼÷Þ{ï½÷Þ{ï½÷º;N'÷ßÿ?\fd
löÎJÚÉž!€ªÈ?~|?"~—?ö7ø5ðü:¿Æ÷÷ÿúÀïtögüî¿ðîâŸùÅàw~ÅwþÍÿ¨ý‹ƒ?èø-·ëOú=³ÿîþ£þùÿâOùï~çâó¿ó×~ëþgòŸÌ¿þÛüžÿÜÿçÿ}¿ò?øÅÿãß/ÿü=‡þ‹åøÿ¿ïùì×,ÿ×á;ÿÎ?ýü®Ð_óOý.¿Ç/ý™ßå÷øè—þÏŸÿ­â/ø%ÿã_ú§þ-ÿÔŸùßÿ¹“?ù¼þ¥ÿÁößþ—þ‰Gÿûÿu÷Wý¿Ö¯ñküßÿ÷PüÓßù×ø5~ÿ'  ÿÿ~ÊE¿š  

It seems like the response body is coming back compressed with gzip, I have turned off Static and Dynamic compression at both the server level and the site level but the response still comes back compressed - what am I missing??

[Timothy]

Hi - after further investigation I found an old module that I used to compress json requests and responses - once this was removed everything worked fine.