gin框架中间件解决跨域问题

http://www.niu12.com/article/45
// 初始化router
router := gin.New()

router.Use(gin.Logger())

router.Use(gin.Recovery())

// 使用跨域中间件
router.Use(cors.Cors())

package cors

import (
   "fmt"
   "github.com/gin-gonic/gin"
   "net/http"
)

// 处理跨域请求,支持options访问
func Cors() gin.HandlerFunc {
   return func(c *gin.Context) {
      method := c.Request.Method
      fmt.Println(method)
      c.Header("Access-Control-Allow-Origin", "*")
      c.Header("Access-Control-Allow-Headers", "Content-Type,AccessToken,X-CSRF-Token, Authorization, Token")
      c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, PATCH, DELETE")
      c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Content-Type")
      c.Header("Access-Control-Allow-Credentials", "true")

      // 放行所有OPTIONS方法，因为有的模板是要请求两次的
      if method == "OPTIONS" {
         c.AbortWithStatus(http.StatusNoContent)
      }

      // 处理请求
      c.Next()
   }
}