Calling Web Api POST always receives null value from jQuery

Question

I'm using ASP.NET Web API, and I'm having a wonderful time. At least with GETs. For some reason when I try to send data via jQuery `$.post()` or `$.ajax()`, the values received by my `ApiController` are always null. What's more strange is that sending data to it with Fiddler does just fine. I'm sure it's a problem with how I'm constructing the object in javascript, but I can't seem to find it. Here is the code: ``` // C# [HttpPost] public HttpResponseMessage BeginTrack([FromBody]string requestContext) { // requestContext is always null. Except when it comes from Fiddler. RequestContext ctx = null; if (Request.Content.Headers.ContentType.MediaType == "application/json") { try { ctx = Json.Decode<RequestContext>(requestContext); } catch (Exception ex) { return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "An error has occured while processing your request. See Exception for details.", ex); } } if (ctx == null) //... ``` And the jQuery... ``` getRequestContext = functi…

Accepted Answer

You need to send `"=mystring"` rather than `"mystring"` from jquery. This is a known issue which is due to the way data are mapped in Web API.

Calling Web Api POST always receives null value from jQuery

Solution

Problem