CODEWITHSUNDEEP
jqueryasp.net-mvc
ericvg
ericvg

Reputation: 3957

Why is Request.ContentType always empty on my requests?

I have a base controller class that attempts to look at Request.ContentType to see if its a json request or a regular HTML request. The base controller then sets a simple enum on the base class and the appropriate controller returns the correct type. However, Request.ContentType is always an empty string. why is that?

my base controller:

namespace PAW.Controllers
{
    public class BaseController : Controller
    {
        public ResponseFormat ResponseFormat { get; private set; }
        public User CurrentUser { get; private set; }

        protected override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            base.OnActionExecuting(filterContext);

            Culture.SetCulture();

            if (this.Request.ContentType.ToLower() == "application/json")
                this.ResponseFormat = ResponseFormat.Json;
            else
                this.ResponseFormat = ResponseFormat.Html;

            Response.Cache.SetCacheability(HttpCacheability.NoCache);

            //setup user object
            this.CurrentUser = WebUser.CurrentUser;
            ViewData["CurrentUser"] = WebUser.CurrentUser;
        }
    }

    public enum ResponseFormat
    {
        Html,
        Json,
        Xml
    }
}

my jquery:

$.ajax({
    type: "GET",
    contentType: "application/json; charset=utf-8",
    url: "/Vendor/Details/" + newid,
    data: "{}",
    dataType: "json",
    success: function(data) { ShowVendor(data); },
    error: function(req, status, err) { ShowError("Sorry, an error occured (Vendor callback failed).  Please try agian later."); }
});

Upvotes: 0

Views: 1022

Answers (3)

Haacked
Haacked

Reputation: 59031

It looks like you're trying to use the ContentType header to determine which type of response to return. That's not what it's for. You should be using the Accepts header instead, which tells the server which content types you accept.

Upvotes: 2

MarkKGreenway
MarkKGreenway

Reputation: 8764

Try using 

 $.ajax({
            type: "GET",
            contentType: "application/json; charset=utf-8",
            url: "/Vendor/Details/" + newid,
            beforeSend: function(xhr) {
                xhr.setRequestHeader("Content-type",
                     "application/json; charset=utf-8");
            },
            data: "{}",
            dataType: "json",
            success: function(data) { alert(data); },
            error: function(req, status, err) { ShowError("Sorry, an error occured (Vendor callback failed).  Please try agian later."); }
        });

a la - http://encosia.com/2008/06/05/3-mistakes-to-avoid-when-using-jquery-with-aspnet-ajax/

Upvotes: 1

Pointy
Pointy

Reputation: 413966

The "content-type" header doesn't do anything when your method is "GET".

Upvotes: 0

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