ASP.Net MVC Getting HTTP 400 with ajax post request

Question

I am trying to post some simple data with ajax from my view to controller. When I switch it to HttpGet it works fine, but when trying httppost I always get error 400. Here is my view code:

@Html.Hidden("postSettings", Url.Action("MethodName", "MyController")) $.ajax({ url: $("#postSettings").val(), type: "POST", data: JSON.stringify(11), dataType: "json", contentType: "application/json", success: function (_result) { console.log("success") }, error: function (e) { console.log(e); } });

And code in my controller:

 [HttpPost] public IActionResult MethodName(object value) { return Ok(); }

Jakub · Accepted Answer · 2021-06-30 10:14:07Z

I did not noticed that I have global filter applied

services.AddMvc(options => { options.Filters.Add(new AutoValidateAntiforgeryTokenAttribute()); });

,adding the CSRF token fixed the problem. I just added this code to my view:

<script type="text/javascript"> function gettoken() { var token = '@Html.AntiForgeryToken()'; token = $(token).val(); return token; } </script>

And to the ajax request:

headers: { RequestVerificationToken: gettoken() },

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