Go | Gin 解决跨域问题跨域配置

在 Gin 中提供了 middleware (中间件) 来做到在一个请求前后处理响应的逻辑，这里我们使用中间来做到在每次请求是添加上 Access-Control-Allow-Origin 头部

1. 编写一个中间件

可以 middlewares 包下创建

package middlewares

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")
		if origin != "" {
			c.Header("Access-Control-Allow-Origin", "*")  // 可将将 * 替换为指定的域名
			c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE")
			c.Header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization")
			c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Cache-Control, Content-Language, Content-Type")
			c.Header("Access-Control-Allow-Credentials", "true")
		}
		if method == "OPTIONS" {
			c.AbortWithStatus(http.StatusNoContent)
		}
		c.Next()
	}
}

2. 使用

pingGroup := r.Group("ping")
{
	pingGroup.GET("/", Ping)
}
r.Use(middlewares.Cors())