随着 RESTFul 的流行，就会牵扯到跨域问题，那么小伙伴有没有被坑过，高人绕过，有需求的请往下看：

location / {
　　if ($request_method = ‘OPTIONS‘) {
　　　　add_header ‘Access-Control-Allow-Origin‘ ‘*‘;
　　　　#
　　　　# Om nom nom cookies
　　　　#
　　　　add_header ‘Access-Control-Allow-Credentials‘ ‘true‘;
　　　　add_header ‘Access-Control-Allow-Methods‘ ‘GET, POST, OPTIONS‘;
　　　　#
　　　　# Custom headers and headers various browsers **should** be OK with but aren‘t
　　　　#
　　　　add_header ‘Access-Control-Allow-Headers‘ ‘DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type‘;
　　　　#
　　　　# Tell client that this pre-flight info is valid for 20 days
　　　　#
　　　　add_header ‘Access-Control-Max-Age‘ 1728000;
　　　　add_header ‘Content-Type‘ ‘text/plain charset=UTF-8‘;
　　　　add_header ‘Content-Length‘ 0;
　　　　return 204;
　　}
　　if ($request_method = ‘POST‘) {
　　　　add_header ‘Access-Control-Allow-Origin‘ ‘*‘;
　　　　add_header ‘Access-Control-Allow-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‘;
　　}
}

大家看这代码是否有点臃肿？那么这样呢？

location / {
　　add_header ‘Access-Control-Allow-Origin‘ ‘*‘;
　　add_header ‘Access-Control-Allow-Credentials‘ ‘true‘;
　　add_header ‘Access-Control-Allow-Methods‘ ‘GET, POST, PUT, DELETE, OPTIONS‘;
　　add_header ‘Access-Control-Allow-Headers‘ ‘DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Token‘;
　　if ($request_method = ‘OPTIONS‘) {
　　　　add_header ‘Access-Control-Max-Age‘ 1728000;
　　　　add_header ‘Content-Length‘ 0;

　　　　return 204;
　　}
}

依然可以达到跨域效果，但是有什么缺点，欢迎交流~

参考 ：https://michielkalkman.com/snippets/nginx-cors-open-configuration/

Nginx 跨域配置