Cross domain calling using jQuery jsonp for ASP.NET web service

Question

My problem is known and discussed here and here . But even after reading and implementing the proposed solutions, I can not do this work.

Problem : web service returning xml insted from json:

<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/">"Now i am getting jsop string""2nd param"</string>

Now break the code into sections:

REMOTE SERVER (IIS 7.0, .NET 4):
web.config:

<?xml version="1.0"?>
<configuration>
        <system.webServer>
            <modules>
                <add name="JsonHttpModule.JsonHttpModule" type="JsonHttpModule"/>
            </modules>
        </system.webServer>
    <system.web.extensions>
        <scripting>
            <webServices>
                <jsonSerialization maxJsonLength="102400"/>
            </webServices>
        </scripting>
    </system.web.extensions>
    <system.web>
        <compilation debug="true" targetFramework="4.0" />
        <customErrors mode="Off"/>
        <webServices>
            <protocols>
                <add name="HttpGet"/>
                <add name="HttpPost"/>
            </protocols>
        </webServices>
    </system.web>
</configuration>

web service:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Script.Services;
using JsonHttpModule;
/// <summary>
/// Summary description for JSONP_EndPoint
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
[System.Web.Script.Services.ScriptService]
public class MyService : System.Web.Services.WebService {
    [WebMethod]
    [ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
    public string Sum(string x, string y)
    {
        return x + y;
    }

}

class HttpModule:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Text;

/// <summary>
/// Summary description for ContentTypeHttpModule
/// </summary>
namespace JsonHttpModule
{
    public class JsonHttpModule : IHttpModule
    {
        private const string JSON_CONTENT_TYPE = "application/json; charset=utf-8";

        public void Dispose()
        {
        }
        public void Init(HttpApplication app)
        {
            app.BeginRequest += OnBeginRequest;
            app.EndRequest += new EventHandler(OnEndRequest);
        }
        public void OnBeginRequest(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpRequest request = app.Request;
            //Make sure we only apply to our Web Service
            if (request.Url.AbsolutePath.ToLower().Contains("MyService.asmx"))
            {
                if (string.IsNullOrEmpty(app.Context.Request.ContentType))
                {
                    app.Context.Request.ContentType = JSON_CONTENT_TYPE;
                }
                app.Context.Response.Write(app.Context.Request.Params["callback"] + "(");
            }
        }
        void OnEndRequest(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpRequest request = app.Request;
            if (request.Url.AbsolutePath.ToLower().Contains("MyService.asmx"))
            {
                app.Context.Response.Write(")");
            }
        }
    }
}

CLIENT PARTY (localhost):

<script>
    $(function () {
        $('#btn_test').click(function () {
            $.ajax({ url: "http://tonofweb.com/MyService.asmx/Sum",
                data: { x: JSON.stringify("Now i am getting jsop string"), y: JSON.stringify("2nd param") },
                dataType: "jsonp",
                success: function (json) {
                    alert(json.d);
                },
                error: function () {
                    alert("Hit error fn!");
                }
            });
    });
});
</script>
    <input id="btn_test" type="button" value="POST" />

so what am i doing wrong here? You can check it yourself in real time. Thank you for your help.

Answer 1

, - JSON, jQuery, , . :

$.ajax({
  url: "http://tonofweb.com/MyService.asmx/Sum",
  contentType: "application/json; charset=utf-8",
  data: { x: JSON.stringify("1"), y: JSON.stringify("2") },
  dataType: "jsonp",
  success: function (json) {
    alert(json.d);
  },
  error: function () {
    alert("Hit error fn!");
  }
});

. contentType: "application/json; charset=utf-8", .

, http://tonofweb.com ( 403 ), jQuery, jQuerify bookmarklet, ( contentType), , ( contentType),

Chrome:

contentType:

<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/">"Now i am getting jsop string""2nd param"</string>

contentType:

{"d":"12"}

, , , JSON . , , , contentType.

. JSON:

ASMX JSON -

HTTP- - /json. ScriptService , JSON .

, , . dataType: "jsonp" dataType: "json", . , - , jQuery JSONP.

, , JSONP :

jQuery17106476630216930062_1326752446188({"d":"12"})

, , JSONP -, : Response.Filter, Response.Write.