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

Це проміжне програмне забезпечення обробляє два типи HTTP-запитів...

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

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

- Kubeadm: during the preflight check "CreateJob" of "kubeadm upgrade", check if there are no nodes where a Pod can schedule. If there are none, show a warning and skip this preflight check. This can happen in single node clusters where the only node was drained. ([#124570](https://github.com/kubernetes/kubernetes/pull/124570), [@neolit123](https://gi...

Le middleware répond à deux types particuliers de requêtes HTTP ...

### Requêtes CORS de pré‑vérification { #cors-preflight-requests }

Il s’agit de toute requête `OPTIONS` avec les en-têtes `Origin` et `Access-Control-Request-Method`.

- kubeadm: removed `socat` and `ebtables` from kubeadm preflight checks ([#127151](https://github.com/kubernetes/kubernetes/pull/127151), [@saschagrunert](https://github.com/saschagrunert)) [SIG Cluster Lifecycle]

* `expose_headers` - 브라우저에서 접근 가능해야 하는 모든 응답 헤더를 나타냅니다. 기본값은 `[]`입니다.
* `max_age` - 브라우저가 CORS 응답을 캐시하는 최대 시간을 초 단위로 설정합니다. 기본값은 `600`입니다.

미들웨어는 두 가지 특정한 종류의 HTTP 요청에 응답합니다...

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

`Origin` 및 `Access-Control-Request-Method` 헤더가 있는 모든 `OPTIONS` 요청입니다.

이 경우 미들웨어는 들어오는 요청을 가로채 적절한 CORS 헤더와 함께, 정보 제공 목적으로 `200` 또는 `400` 응답을 반환합니다.

### 단순한 요청 { #simple-requests }

- The flag `--skip-preflight-checks` of kubeadm has been removed. Please use `--ignore-preflight-errors` instead. ([#62727](https://github.com/kubernetes/kubernetes/pull/62727), [@xiangpengzhao](https://github.com/xiangpengzhao))

proxy_read_timeout flag to kubeapi_load_balancer charm. ([#57926](https://github.com/kubernetes/kubernetes/pull/57926), [@wwwtyro](https://github.com/wwwtyro))

* Check for known manifests during preflight instead of only checking for non-empty manifests directory. This makes the preflight checks less heavy-handed by specifically checking for well-known files (kube-apiserver.yaml, kube-controller-manager.yaml, kube-scheduler.yaml, etcd.yaml) in /etc/kubernetes/manifests instead of simply checking...

* kubeadm now produces error during preflight checks if swap is enabled. Users, who can setup kubelet to run in unsupported environment with enabled swap, will be able to skip that preflight check. ([#55399](https://github.com/kubernetes/kubernetes/pull/55399), [@kad](https://github.com/kad))

# Allowed origins for CORS.
api.cors.allow.origin=*
# Allowed HTTP methods for CORS.
api.cors.allow.methods=GET, POST, OPTIONS, DELETE, PUT
# Max age for CORS preflight requests.
api.cors.max.age=3600
# Allowed headers for CORS.
api.cors.allow.headers=Origin, Content-Type, Accept, Authorization, X-Requested-With
# Whether to allow credentials for CORS.
api.cors.allow.credentials=true

- Kubeadm: allow RSA and ECDSA format keys in preflight check ([#112535](https://github.com/kubernetes/kubernetes/pull/112535), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

## Dependencies

### Added
_Nothing has changed._

### Changed