net/http 包 #

func handler(w http.ResponseWriter, r _http.Request) {
    w.Header().Set("Access-Control-Allow-Origin", "_")
}

gin 包 #

gin/cros #

导入包

import (
	"github.com/gin-contrib/cors"
	"github.com/gin-gonic/gin"
)

设置跨域中间件

r.Use(cors.Default())

自定义中间件 #

// 设置跨域请求的中间件
r.Use(func(c *gin.Context) {
    c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
    c.Writer.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
    c.Writer.Header().Set("Access-Control-Allow-Headers", "Origin, Content-Type, Content-Length, Accept-Encoding, Authorization")
    if c.Request.Method == "OPTIONS" {
        c.AbortWithStatus(204)
        return
    }
    c.Next()
})