在ElasticBeanstalk中的nginx服務器上啟用CORS？

Question

我將Nodejs應用程序部署到運行nginx的AWS Elastic Beanstalk。

該應用程序本質上是一個api，我可以對其進行調用並檢索回JSON數據，即myapi.awselasticbeanstalk.com/api/get_stuff等。

我試圖啟用CORS，以便我可以從我的javascript應用程序（客戶端）訪問服務器。

根據亞馬遜文檔，我可以編輯或擴展nginx配置，將配置文件添加到.ebextensions文件夾。

cors.config

files:
  /etc/nginx/conf.d/cors.conf:
    mode: "000644"
    owner: root
    group: root
    content: |
        location / {
             if ($request_method = 'OPTIONS') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                #
                # Custom headers and headers various browsers *should* be OK with but aren't
                #
                add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
                #
                # Tell client that this pre-flight info is valid for 20 days
                #
                add_header 'Access-Control-Max-Age' 1728000;
                add_header 'Content-Type' 'text/plain; charset=utf-8';
                add_header 'Content-Length' 0;
                return 204;
             }
             if ($request_method = 'POST') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
                add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
             }
             if ($request_method = 'GET') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
                add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
             }
        }

但這仍然不適合我。

Answer 1

如果您在節點/ express應用程序發出的響應中設置CORS標頭，則無需向Nginx配置添加任何內容。

以下是對我有用的配置，該配置也在Beanstalk上運行node.js，以及在Cloudfront托管的客戶端應用程序調用API。

根據需要修改：

server.use(function(req, res, next) {
  res.header('Access-Control-Allow-Origin', '*')
  res.header('Access-Control-Allow-Credentials', true)
  res.header('Access-Control-Allow-Methods', 'POST, GET, OPTIONS')
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept')
  next()
})