WebAPI - 405 - The resource does not support http 'POST'

Question

Hi, I'm working on WebAPI, with a controller having C[HttpPost] R[HttpGet] U[HttpPut] D[HttpDelete]

/// <summary>
/// WebAPI - Controller
/// </summary>
public class PersonController : ApiController
{
    static IList<Person> personsList = LoadPersons();

    /// <summary>
    /// Get list of all Persons
    /// </summary>
    /// <returns><list type="Person">Persons</list></returns>
    [HttpGet]
    [Route("api/Person/")]
    public IHttpActionResult GetPerson()

    {
        return Ok(personsList);
    }

    /// <summary>
    /// Get a person based on input - entityId
    /// </summary>
    /// <param name="entityId"></param>
    /// <returns>A single person matching id</returns>
    [HttpGet]
    [Route("api/Person/{entityId:int?}")]
    public IHttpActionResult GetPersonById([FromUri]int? entityId)
    {
        if (entityId != null)
        {
       var person = personsList.Where(p => p.EntityId == entityId).SingleOrDefault();
            return Ok(person);
        }
        return BadRequest("Invalid EntityId !!, can't have invalid chars");
    }

    /// <summary>
    /// Add a new person with specifed data
    /// </summary>
    /// <param name="personData"></param>
    /// <returns>Ok, if success</returns>
    [HttpPost]
    public IHttpActionResult SavePerson([FromBody]Person personData)
    {
        if (personData != null)
        {
            personsList.Add(personData);
            return Ok();
        }
        return BadRequest("Invalid !!");
    }

    /// <summary>
    /// Modify existing person's email-Id based on Id
    /// </summary>
    /// <param name="personData"></param>
    /// <returns></returns>
    [HttpPut]
    public IHttpActionResult UpdatePerson([FromBody]Person personData)
    {
        if (personData != null)
        {
            var person = personsList.Where(p => p.EntityId == personData.EntityId).SingleOrDefault();
            person.Email = personData.Email;
            return Ok(person);
        }
        return BadRequest("Invalid !!");
    }

    /// <summary>
    /// Remove a specifc person based on Id
    /// </summary>
    /// <param name="entityId"></param>
    /// <returns></returns>
    [HttpDelete]
    public IHttpActionResult RemovePerson(int? entityId)
    {
        if (entityId != null)
        {
    var delPerson = personsList.Where(p => p.EntityId == entityId).SingleOrDefault();
            personsList.Remove(delPerson);
            return Ok();
        }
        return BadRequest("Invalid !!");
    }
    private static List<Person> LoadPersons()
    {
        var persons = new List<Person>();
        persons.Add(new Person { Email = "ron's Email", EntityId = 01, Name = "ron" });
    persons.Add(new Person { Email = "saun's Email", EntityId = 02, Name = "saun" });
        persons.Add(new Person { Email = "jae's Email", EntityId = 03, Name = "jae" });
        return persons;
    }
}

I'm able to do GET request and list person(s)

 

But when i try to do a POST/ PUT/ DELETE request i'm getting response as '"The requested resource does not support http method 'POST'/ 'PUT'/ 'DELETE''.

 

What am i missing here? help me to figure my mistake