import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

/**
 * Filter for handling Cross-Origin Resource Sharing (CORS) requests.
 * Processes CORS headers and handles preflight OPTIONS requests.
 */
public class CorsFilter implements Filter {

    /**
     * Creates a new instance of CorsFilter.
     */
    public CorsFilter() {
        // Default constructor
    }

     * CORS header for allowing credentials.
     */
    protected static final String ACCESS_CONTROL_ALLOW_CREDENTIALS = "Access-Control-Allow-Credentials";

    /**
     * CORS header for specifying cache duration for preflight requests.
     */
    protected static final String ACCESS_CONTROL_MAX_AGE = "Access-Control-Max-Age";

    /**
     * Processes the CORS request by setting appropriate headers.
     *

* `max_age` - Sets a maximum time in seconds for browsers to cache CORS responses. Defaults to `600`.

The middleware responds to two particular types of HTTP request...

### CORS preflight requests { #cors-preflight-requests }

These are any `OPTIONS` request with `Origin` and `Access-Control-Request-Method` headers.

* `max_age` - Встановлює максимальний час (у секундах) для кешування CORS-відповідей у браузерах. За замовчуванням `600`.

Цей middleware обробляє два типи HTTP-запитів...

### Попередні CORS-запити (preflight requests)

Це будь-які `OPTIONS` - запити, що містять заголовки `Origin` та `Access-Control-Request-Method`.

* `max_age` - Establece un tiempo máximo en segundos para que los navegadores almacenen en caché los responses CORS. Por defecto es `600`.

El middleware responde a dos tipos particulares de request HTTP...

### Requests de preflight CORS

Estos son cualquier request `OPTIONS` con headers `Origin` y `Access-Control-Request-Method`.

* `max_age` - Define um tempo máximo em segundos para os navegadores armazenarem em cache as respostas CORS. O padrão é `600`.

O middleware responde a dois tipos específicos de solicitação HTTP...

### Requisições CORS pré-voo (preflight)

Estas são quaisquer solicitações `OPTIONS` com cabeçalhos `Origin` e `Access-Control-Request-Method`.

        assertTrue(mockFilterChain.wasDoFilterCalled());
        assertTrue(handler.wasProcessCalled());
        assertEquals(0, mockResponse.getStatus());
    }

    // Test with OPTIONS request (preflight)
    public void test_doFilter_withCorsHandler_options() throws IOException, ServletException {
        String origin = "http://example.com";
        mockRequest.setHeader("Origin", origin);

- kubeadm: removed preflight check for nsenter on Linux nodes

* New kubeadm flag `--ignore-preflight-errors` that enables to decrease severity of each individual error to warning. ([#56072](https://github.com/kubernetes/kubernetes/pull/56072), [@kad](https://github.com/kad))
    * Old flag `--skip-preflight-checks` is marked as deprecated and acts as `--ignore-preflight-errors=all`

([#72214](https://github.com/kubernetes/kubernetes/pull/72214), [@caesarxuchao](https://github.com/caesarxuchao))

- kubeadm
  - `kubeadm alpha preflight` and `kubeadm alpha preflight node` are removed; you can now use `kubeadm join phase preflight` ([#73718](https://github.com/kubernetes/kubernetes/pull/73718), [@fabriziopandini](https://github.com/fabriziopandini))