OPTIONS 405 (Method Not Allowed) regardless server sends Access-Control-Allow-Methods:OPTIONS, GET, HEAD, POST

Question

I\'m trying to make cross-domain request and my server is configured to send the following headers:

Access-Control-Allow-Credentials:true
Access-Control-Allow-He         


        

Answer 1

I would suggest 2 solutions:

1) If you are using WebAPI you need to implement the option method that by convention should look like:

public class XXXController : ApiController
{
    // OPTION http-verb handler
    public string OptionsXXX()
    {
        return null; // HTTP 200 response with empty body
    }

    ...
}

2) If you are not using WebAPI try to understand which part of your code triggers the OPTIONS 405 (Method Not Allowed) error for the OPTION call. In that case I would check if trying to add to the Web.config file these that works: