ingress 反向代理 ws

```
kind: Service
apiVersion: v1
metadata:
  name: im-ws-proxy
  namespace: chat
spec:
  type: ExternalName
  externalName: k8s.elb.ap-southeast-1.amazonaws.com
  ports:
    - name: http
      port: 15018
---
kind: Ingress
apiVersion: networking.k8s.io/v1
metadata:
  name: im-ws-proxy-ingress
  namespace: chat
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/proxy-body-size: 100m
    nginx.ingress.kubernetes.io/proxy-send-timeout: "600"
    nginx.ingress.kubernetes.io/proxy-read-timeout: "600"
    nginx.ingress.kubernetes.io/backend-protocol: HTTP # 改为 HTTP 或 HTTPS，取决于后端的支持
    nginx.ingress.kubernetes.io/upstream-vhost: k8s.elb.ap-southeast-1.amazonaws.com
    nginx.ingress.kubernetes.io/use-forwarded-headers: "true"
    nginx.ingress.kubernetes.io/keep-alive-timeout: "600" # 设置长连接的保持时长
    nginx.ingress.kubernetes.io/proxy-keepalive: "100" # 设置长连接的最大请求数
    nginx.ingress.kubernetes.io/real-ip-header: "X-Forwarded-For"
    nginx.ingress.kubernetes.io/set-real-ip-from: "0.0.0.0/0"
spec:
  ingressClassName: nginx
  rules:
    - host: im-ws.eball.vn
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: im-ws-proxy
                port:
                  name: http

```