Accessing Data in Httphandler sent using post request

I have created a httphandler. Everything is working fine If you take the request type GET. But I really don't want GET request due to security reasons.

I am making a POST request using Jquery using following code:

$.ajax({
        type: "POST",
        async: false,
        url: "SaveAccounts",
        data: { a: "Sent Data" },
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function OnSuccess(a) {
            alert(a);
        },
        error: function OnError(request, status, error) {
            alert('Error: ' + request + ' ' + status + ' ' + error);
        },
        complete: function () {

        }
    });

And the code for processing request is:

    context.Response.ContentType = "application/json; charset=utf-8"
    Dim s As开发者_如何学Go String = context.Request.Params("a")
    context.Response.Write(JsonConvert.SerializeObject(s))

This code is returning 'null' in javascript alert in client side.

Please note every thing is working fine when request type is changed to GET in $.ajax() function.

I have also tried to access posted data using context.Request.Form("a") and context.request.SserverVariables("a")

context.request.Params is a combined collection of 'Form', 'ServerVariables', 'Cookies' etc.

Please tell me where I am going wrong...??

Thanks for looking....

---

This is working by just removing contentType and dataType specification from the request. Anything other than this will remain unchanged.

---

Try

data: { "a=Sent Data" },

e.g. from http://api.jquery.com/jQuery.ajax/

$.ajax({
   type: "POST",
   url: "some.php",
   data: "name=John&location=Boston",
   success: function(msg){
     alert( "Data Saved: " + msg );
   }
 });

Also the HttpHandlers don't like JSON data so get rid of the contentType and the dataType.

Escaping it - a more complete example

var dataString = "{ 'first' : '" + escape($('#fname').val()) +
    "', 'mail' : '" + escape($('#tbMail1').val()) +
    "', 'mailinglist' : '" + $("input[name='ml']:checked").val() +
    "' }";
    /*alert(dataString.replace('\',','\',\n'));*/ // just for debugging ;)

$.ajax({
    type: "POST",
    url: "myAjaxHandler.asmx/ProcessSampleForm",
    data: dataString,
    cache: false,
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (msg) {
        $(".loadingimg").fadeOut();
        window.location.replace(msg.d);
    },
    error:function(xhr,err){
        $(".loadingimg").fadeOut();
        alert("readyState: " + xhr.readyState + "\nstatus: " + xhr.status);
        alert("responseText: " + xhr.responseText);
    }
});

Taken from http://www.jphellemons.nl/post/JQuery-with-webform-input-validation-ajax-posting-json-to-aspnet-C.aspx