Question

我在两个不同的Pod上运行React前端和Nodejs REST API作为后端，我为两个Pod添加了nginx入口。但是，当我尝试从前端访问nodejs时，我得到了503。我尝试了许多解决方案，但没有一个起作用。

我已经尝试在nodejs入口中给出以下注释

nginx.ingress.kubernetes.io/enable-cors: "true"
nginx.ingress.kubernetes.io/cors-allow-methods: "PUT, GET, POST, OPTIONS"     
nginx.ingress.kubernetes.io/cors-allow-origin: "*"
nginx.ingress.kubernetes.io/cors-allow-credentials: "true"

下面是我用于前端和后端nodejs api的入口文件

backend-ingress.yml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: coreapi-ingress
  annotations:
     kubernetes.io/ingress.class: nginx
     ingress.kubernetes.io/enable-cors: "true"
     nginx.ingress.kubernetes.io/cors-allow-methods: "PUT, GET, POST, OPTIONS"     
     nginx.ingress.kubernetes.io/cors-allow-origin: "*"
     nginx.ingress.kubernetes.io/cors-allow-headers: "Access-Control-Allow-Origin"
     nginx.ingress.kubernetes.io/cors-allow-credentials: "true"     
spec:
  rules:
  - host: backend-api.com
    http:
      paths:
      - path: /
        backend:
          serviceName: backend-api
          servicePort: 80
  tls:
  - secretName: generic
    hosts:
    - backend-api.comm

frontend-ingress.yml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: exchange-ingress
  annotations:
     kubernetes.io/ingress.class: nginx
spec:
  rules:
  - host: front-end.com
    http:
      paths:
      - path: /
        backend:
          serviceName: webserver
          servicePort: 80
  tls:
  - secretName: generic
    hosts:
    - front-end.com

从前端应用程序调用后端时出现以下错误

Access to XMLHttpRequest at 'https://backend-api.com/api/v1/user/login' from origin 'https://front-end.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

我注意到POST请求被重定向到OPTIONS

Request URL: https://backend-api.com/api/v1/user/login
Request Method: OPTIONS
Status Code: 503 
Remote Address: 104.25.214.4:443
Referrer Policy: no-referrer-when-downgrade

Request Headers

Provisional headers are shown
Access-Control-Request-Headers: content-type
Access-Control-Request-Method: POST
Origin: https://front-end.com
Referer: https://front-end.com/login
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36

使用nginx入口的Kubernetes中出现“ 503服务不可用”错误。怎么修？

0 个答案: