【代码】Gin设置允许跨域访问

Gin设置允许跨域访问的中间件

• 在挂载路由之前设置允许跨域访问

func main() {
	app := gin.Default()

// 设置允许跨域访问
	app.Use(Cors())
	// 挂载路由
        ...

app.Run()
}

// 允许跨域访问中间件
func Cors() gin.HandlerFunc {
	return func(context *gin.Context) {
		method := context.Request.Method
		origin := context.Request.Header.Get("Origin")
		var headerKeysArr []string
		for key, _ := range context.Request.Header {
			headerKeysArr = append(headerKeysArr, key)
		}
		headerKeysStr := strings.Join(headerKeysArr, ",")
		if headerKeysStr != "" {
			headerKeysStr = fmt.Sprint("access-control-allow-origin, access-control-allow-headers, %s", headerKeysStr)
		} else {
			headerKeysStr = "access-control-allow-origin, access-control-allow-headers"
		}
		if origin != "" {
			context.Writer.Header().Set("Access-Control-Allow-Origin", "*")
			context.Header("Access-Control-Allow-Origin", "*")
			context.Header("Access-Control-Allow-Methods", "GET, POST, OPTIONS, PUT, DELETE, UPDATE")
			context.Header("Access-Control-Allow-Headers", "Authorization, Content-Length, X-CSRF-Token, Token, session, X_Requested_With,Accept, Origin, Host, Connection, Accept-Encoding, Accept-Language,DNT, X-CustomHeader, Keep-Alive, User-Agent, X-Requested-With, If-Modified-Since, Cache-Control, Content-Type, Pragma")
			context.Header("Access-Control-Allow-Credentials", "false")
			context.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Cache-Control, Content-Language, Content-Type, Expires, Last-Modified, Pragma, FooBar")
			context.Header("Access-Control-Max-Age", "172800")
			context.Set("content-type", "application/json")

if method == "OPTIONS" {
				context.JSON(200, "Options Request!")
			}

context.Next()
		}
	}
}

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CSDN——私念