ValuesController.cs

[EnableCors(origins: "*", headers: "*", methods: "*")]
// [Authorize]
public class ValuesController : ApiController
{
    private static List<string> values = new List<string>();
    // GET api/values
    public IEnumerable<string> Get()
    {
        return values;
    }

    // GET api/values/?index=3
    public string Get(int index)
    {
        return values.ElementAtOrDefault(index);
    }

    // POST api/values
    public void Post([FromBody]string value)
    {
        values.Add(value);
    }

    // PUT api/values/5
    public void Put(int index, [FromBody]string value)
    {
        if (values.Count > index)
            values[index] = value;
        else
            Post(value);
    }

    // DELETE api/values/5
    public void Delete(int index)
    {
        if (values.Count > index)
            values.RemoveAt(index);
    }
}