N久N久没写代码。
今天和VUE配合调用接口的时候发现跨域报错。
中间件，入口文件、路由都折腾了好几遍。有以下几个错误来回变。
错误1：
Access to XMLHttpRequest at 'http://39.xx.xxxx.145/columns?_t=1604652551912' from origin 'http://192.168.199.243:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
错误2：
Access to XMLHttpRequest at 'http://39.104.126.145/columns?_t=1604655553900' from origin 'http://192.168.199.243:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status.
错误3
Request header field timestamp is not allowed by Access-Control-Allow-Header
最后的解决方案
入口文件index.php 最上面写这样一段
header("Access-Control-Allow-Origin: *");
if($_SERVER['REQUEST_METHOD'] == 'OPTIONS'){
header("Access-Control-Allow-Headers: *");
header('Access-Control-Allow-Methods: GET, POST, PUT,DELETE,OPTIONS,PATCH');
exit;
}