CORS enabled but response for preflight has invalid HTTP status code 404 when POSTing JSON

Question

I\'ve searched thoroughly but cannot find a solution to this issue in my particular circumstance.

Cross-domain service calls using Fiddler (POST) execute correctly a

Answer 1

For asp core use this code in Startup.cs in Configure procedure. I used for 2.0 version but i think it should work with older too

app.UseCors(builder => {
                builder.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader();
            });