1、配置允许跨域请求
Header always set Access-Control-Allow-Origin "*"
Header always set Access-Control-Allow-Methods "POST, GET, OPTIONS, DELETE, PUT"
Header always set Access-Control-Max-Age "1000"
Header always set Access-Control-Allow-Headers "x-requested-with, Content-Type, origin, authorization, accept, client-security-token"
一定要加always；
Max-Age设的是OPTIONS请求的缓存时间，单位秒
2、有些被代理服务器在请求OPTIONS时会返回403，建议代理服务器配置所有OPTIONS都返回200
RewriteEngine On
RewriteCond %{REQUEST_METHOD} OPTIONS
RewriteRule ^(.*)$ $1 [R=200,L]
所有OPTIONS请求都返回200，应视服务器使用情况而定
https://benjaminhorn.io/code/setting-cors-cross-origin-resource-sharing-on-apache-with-correct-response-headers-allowing-everything-through/