直接设置跨域参数

新建 cors 文件

package cors

import (
	"time"

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

func Cors() gin.HandlerFunc {
	c := cors.Config{
		AllowAllOrigins: true,
		AllowMethods:    []string{"GET", "POST", "PUT", "DELETE", "PATCH"},
		AllowHeaders:    []string{"Content-Type", "Access-Token", "Authorization"},
		MaxAge:          6 * time.Hour,
	}

	return cors.New(c)
}

CORS 跨域中间件

新建 cors 文件

package cors

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

// 处理跨域请求,支持options访问
func Cors() gin.HandlerFunc {
	return func(c *gin.Context) {
		method := c.Request.Method

		c.Header("Access-Control-Allow-Origin", "*")
		c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE")
		c.Header("Access-Control-Allow-Headers", "*")
		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")

		//放行所有OPTIONS方法
		if method == "OPTIONS" {
			c.AbortWithStatus(http.StatusNoContent)
		}
		// 处理请求
		c.Next()
	}
}

二选一 跨域设置

func main() {
	r := gin.New()

        // 跨域设置
	r.Use(Cors())

	r.GET("/test", func(c *gin.Context) {
		example := c.MustGet("example").(string)

		// 打印："12345"
		log.Println(example)
	})

	// 监听并在 0.0.0.0:8080 上启动服务
	r.Run(":8080")
}