Why is my ASP.NET Web API route working with Postman but not working with Angular Post request

Question

I have no idea what\'s going on here. I have a POST route using ASP.NET web API that should change some data in my SQL Server. When I use Postman to test out my REST API it work

Answer 1

Postman does not send a XmlHttp Request. With postman you're manually interacting with a site so that you have full control. However in your web application you are making a Cross Origin Request.You need to enable CORS in your Api.
You can read more about CORS in Asp.Net Web API here.

Answer 2

In Global.asax.cs file add following code

protected void Application_BeginRequest()
    {
        if (Request.Headers.AllKeys.Contains("Origin") && Request.HttpMethod == "OPTIONS")
        {
            Response.Flush();
        }
    }