Issue is due CORS, it should be enabled in WEBAPI project. The CORS enabling not works through WEB.config code, you need to enable CORS through backend.
Note - remove all web.config CORS enabling code if its there in web.config i.e the below code
name="Access-Control-Allow-Origin" value="*" />
name="Access-Control-Allow-Headers" value="Content-Type" />
name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
Steps 1. Install CORS package Install-Package Microsoft.AspNet.WebApi.Cors for WEBAPI project 2. In WebApiConfig.cs add this code
var corsAttribute = new EnableCorsAttribute("*","Origin, Content-Type, Accept",
"GET, PUT, POST, DELETE, OPTIONS");
config.EnableCors(corsAttribute);
Done.
