Web Api Ajax Post call throws Http 405 error

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ASP.NET

Javascript

Ajax

MVC

jQuery

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I am calling Asp.net web api Post methos which has one parameter named value of type string.

Code as below:

In ValueController:

public IHttpActionResult Post(string value)
      {
          return Created(Request.RequestUri + "/" + "id=5", value);
      }

Jquery Calling Web Api:

$.ajax({
                    url: 'http://localhost:63022/api/values',
                    type: 'POST',
                    data: '{"value":"ravi"}',
                    contentType: "application/json;charset=utf-8",
                    crossDomain : true,
                    success: function (data) {
                        alert('success');
                    },
                    error: function (x, y, z) {
                        alert('error');
                    }
                });

Question 1:
When I run this code and call web api Post method using above jquery ajax call, I get Http error 405 method not allowed.

Question 2:

Modification in ValueController, adding FromBody attribute

public IHttpActionResult Post([FromBody]string value)
       {
           return Created(Request.RequestUri + "/" + "id=5", value);
       }

When I run this code and call web api Post method using above jquery ajax call, I get null in string value action method parameter [Post([FromBody]string value)].

Is it mandatory to write FromBody attribute for Post method to work in Question 1?

Guys please help me out for question 1 and 2...