Nginx 跨域配置：添加 Access-Control-Allow-Origin

Nginx 配置文件参考

location ~* \.(eot|ttf|woff|woff2)$ {
    add_header Access-Control-Allow-Origin *;
}

https://enable-cors.org/server_nginx.html

#
# Wide-open CORS config for nginx
#
location / {
     if ($request_method = 'OPTIONS') {
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
        #
        # Custom headers and headers various browsers *should* be OK with but aren't
        #
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
        #
        # Tell client that this pre-flight info is valid for 20 days
        #
        add_header 'Access-Control-Max-Age' 1728000;
        add_header 'Content-Type' 'text/plain; charset=utf-8';
        add_header 'Content-Length' 0;
        return 204;
     }
     if ($request_method = 'POST') {
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range' always;
        add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
     }
     if ($request_method = 'GET') {
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range' always;
        add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
     }
}

https://segmentfault.com/a/1190000012028144

location / {
   # 检查域名后缀
   if ($http_origin ~ \.test\.com) {
        add_header Access-Control-Allow-Origin $http_origin;
        add_header Access-Control-Allow-Methods GET,POST,OPTIONS;
        add_header Access-Control-Allow-Credentials true;
        add_header Access-Control-Allow-Headers DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type;
        add_header Access-Control-Max-Age 1728000;
   }
   # options 请求不转给后端，直接返回 204
   # 第二个 if 会导致上面的 add_header 无效，这是 nginx 的问题，这里直接重复执行下
   if ($request_method = OPTIONS) {
        add_header Access-Control-Allow-Origin $http_origin;
        add_header Access-Control-Allow-Methods GET,POST,OPTIONS;
        add_header Access-Control-Allow-Credentials true;
        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 1728000;
        return 204;
   }

   # 其他请求代理到后端
   proxy_set_header Host $host;
   proxy_redirect off;
   proxy_set_header X-Real-IP $remote_addr;
   proxy_set_header X-Scheme $scheme;
   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
   proxy_set_header X-Forwarded-Proto $scheme;
   proxy_pass http://xxx.xxx.xxx.xxx;
}

https://serverfault.com/questions/162429/how-do-i-add-access-control-allow-origin-in-nginx

后记

原理 https://developer.mozilla.org/zh-CN/docs/Web/HTTP/CORS

见 https://serverfault.com/questions/162429/how-do-i-add-access-control-allow-origin-in-nginx