Nginx 添加标头和 proxy_pass 以绕过 CORS

Question

我想在 proxy_pass 服务器上使用 API 创建 CORS 站点。但

location / {

     if ($request_method = 'OPTIONS') {
        add_header 'Access-Control-Allow-Origin' '*';

        add_header 'Access-Control-Allow-Credentials' 'true';
        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';

        add_header 'Access-Control-Max-Age' 86400;
        add_header 'Content-Type' 'text/plain charset=UTF-8';
        add_header 'Content-Length' 0;
        return 204; break;
     }
     if ($request_method = 'POST') {
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Credentials' 'true';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
     }
     if ($request_method = 'GET') {
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Credentials' 'true';
        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';
     }



  location /api/ {
    proxy_pass       http://api:8080/;
    proxy_set_header Host      $host:$server_port;
    proxy_set_header X-Real-IP $remote_addr;
  }
}

从上游返回405。如果没有 proxy_pass，此代码片段将按预期工作。

如何打破并返回204？

Answer 1

Ifs不适用于子位置。Nginx 首先解析位置并运行它，而不解析父代的代码。

proxy_pass不在里面工作if。但它需要在每个地点进行复制。

这样我就可以if在子位置内移动。

server {
  listen 8080 default_server;
  listen [::]:8080 default_server;
  server_name _;

  location /api/ {

       if ($request_method = 'OPTIONS') {
        add_header 'Access-Control-Allow-Origin' '*';

        add_header 'Access-Control-Allow-Credentials' 'true';
        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';

        add_header 'Access-Control-Max-Age' 86400;
        add_header 'Content-Type' 'text/plain charset=UTF-8';
        add_header 'Content-Length' 0;
        return 204; break;
     }

     if ($request_method = 'POST') {
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Credentials' 'true';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
     }
     if ($request_method = 'GET') {
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Credentials' 'true';
        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';
     }

    proxy_pass       http://api:8080/;
    proxy_set_header Host      $host:$server_port;
    proxy_set_header X-Real-IP $remote_addr;
  }
...
}