CORS not passing PUT request?

Question

Jetty

I am accessing the server on jetty via fetch.
The response contains headers:
resp.addHeader("Access-Control-Allow-Origin", "*");
resp.addHeader("Access-Control-Allow-Methods", "PUT");
resp.addHeader("Access-Control-Allow-Headers", "Content-Type");
But the browser issues
Fetch API cannot load localhost:8081/admin/country. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin ' localhost:63343 ' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
With GET it works fine.
What is the reason for this strange behavior of the browser?

Answer 1

Read this article about CORS
You may be trying to pass headers or login with PUT. In this case, you must have https set and the response headers:

Access-Control-Allow-Credentials: true // Можно ли авторизовываться или нет
Access-Control-Allow-Origin: https://localhost:63343
Access-Control-Allow-Methods: PUT, OPTIONS
Access-Control-Allow-Headers: Content-Type, ... прочие заголовки, например Authorization или тот в котором логин и пароль