Syntax: add_header name value [always];Default: --Context:http,server,location,if in location

例：/etc/nginx/conf.d/default.conf

server {    listen       80;    server_name  localhost;    sendfile on;    #charset koi8-r;    #access_log  /var/log/nginx/log/static_access.log  main;    location ~ .*\.(htm|html)$ {        add_header Access-Control-Allow-Origin *; # *是允许所有，也可指定        add_header Access-Control-Allow-Methods GET,POST,PUT,DELETE;        root /opt/app/code;    }... ...