Go-Gin 跨域处理
背景
跨域一般有两种方法:
- 网络代理层,如nginx层拦截处理;
- 后端服务处理;
这里简单说下Go Gin框架的解决办法
解决方法
需要在 Gin 中提供了 middleware (中间件) 来处理请求前后的前置和后置逻辑。
中间件文件:
package middleware import ( "github.com/gin-gonic/gin" "net/http" ) func Cors() gin.HandlerFunc { return func(c *gin.Context) { method := c.Request.Method origin := c.Request.Header.Get("Origin") //请求头部 if origin != "" { //接收客户端发送的origin (重要!) c.Writer.Header().Set("Access-Control-Allow-Origin", origin) //服务器支持的所有跨域请求的方法 c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE,UPDATE") //允许跨域设置可以返回其他子段,可以自定义字段 c.Header("Access-Control-Allow-Headers", "Authorization, Content-Length, X-CSRF-Token, Token,session") // 允许浏览器(客户端)可以解析的头部 (重要) c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers") //设置缓存时间 c.Header("Access-Control-Max-Age", "172800") //允许客户端传递校验信息比如 cookie (重要) c.Header("Access-Control-Allow-Credentials", "true") // //c.Header("Content-Type", "application/json") } //允许类型校验 if method == "OPTIONS" { c.Header("Access-Control-Allow-Origin", "*") c.Header("Access-Control-Allow-Headers", "Content-Type,AccessToken,X-CSRF-Token, Authorization") //自定义 Header c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS") 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") c.AbortWithStatus(http.StatusNoContent) } defer func() { if err := recover(); err != nil { log.Printf("Panic info is: %v", err) } }() c.Next() } }
应用中间件:
package main import( "gin/middleware" "github.com/gin-gonic/gin" ) func main(){ gin.SetMode(gin.ReleaseMode) engine = gin.Default() engine.Use(middleware.Cors()) }