beego跨域问题

• what is it
• how it looks like

• how to solve

import "github.com/astaxie/beego/plugins/cors"
// 跨域问题尝试解决
	beego.InsertFilter("*", beego.BeforeRouter, cors.Allow(&cors.Options{
		//允许访问所有源
		AllowAllOrigins: true,
		//可选参数"GET", "POST", "PUT", "DELETE", "OPTIONS" (*为所有)
		//其中Options跨域复杂请求预检
		AllowMethods: []string{"*"},
		//指的是允许的Header的种类
		AllowHeaders: []string{"*"},
		//公开的HTTP标头列表
		ExposeHeaders: []string{"Content-Length"},
		//如果设置，则允许共享身份验证凭据，例如cookie
		AllowCredentials: true,
	}))



	beego.Controller.Ctx.ResponseWriter.Header().Set("Access-Control-Allow-Origin",
		beego.Controller.Ctx.Request.Header.Get("Origin"))

• why