[Nginx] Nginx解决转发地址时跨域的问题

XMLHttpRequest cannot load ******. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.

http {
  include mime.types;
  server {
  listen  80;
  server_name localhost;
  charset UTF-8;
 
  location / {
  root html;
  index index.html index.htm;
  }
 
  # Avoid CORS and reverse proxy settings
  location /api/ { # [2]
    proxy_http_version 1.1;
    proxy_pass http://www.des.com/; # [3]
 
    add_header Access-Control-Allow-Origin *;
    add_header Access-Control-Allow-Methods "POST, GET, OPTIONS";
    add_header Access-Control-Allow-Headers "Origin, Authorization, Accept";
    add_header Access-Control-Allow-Credentials true;
  }
  }
}

127.0.0.1 www.des.com