No 'Access-Control-Allow-Origin' header is present on the requested resource.

我的环境：
| Grails Version: 3.1.4
| Groovy Version: 2.4.6
| JVM Version: 1.7.0_80

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错误信息：

XMLHttpRequest cannot load http://xxx. No 'Access-Control-Allow-Origin' header is present on the requested resource.
Origin 'http://xxx:8100' is therefore not allowed access.

解决方法：
1、对控制器进行拦截，然后在响应头中加入Access-Control-Allow-Origin","*"即可


如控制器是：UserController
则对应的拦截器是：UserInterceptor
class UserInterceptor {


boolean before() {
header("Access-Control-Allow-Origin","*") // 在这里加即可
true
}


boolean after() { true }


void afterView() {
// no-op
}
}
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注：grails创建拦截器命令如下：
grails create-interceptor 拦截器名称
grails create-interceptor Book

grails create-interceptor org.bookstore.book