gin框架中全局跨域请求处理设置

跨域访问的问题

OPTIONS请求

全局跨域访问中间件

// 跨域访问：cross origin resource share
func Cors() gin.HandlerFunc {
	return func(context *gin.Context) {
		method := context.Request.Method
		origin := context.Request.Header.Get("Origin")
		var headerKeys []string
		for k, _ := range context.Request.Header {
			headerKeys = append(headerKeys, k)
		}
		headerStr := strings.Join(headerKeys, ",")
		if headerStr != "" {
			headerStr = fmt.Sprintf("access-control-allow-origin, access-control-allow-headers, %s", headerStr)
		} else {
			headerStr = fmt.Sprintf("access-control-allow-origin, access-control-allow-headers")
		}
		if origin != "" {
			context.Writer.Header().Set("Access-Control-Allow-Origin", "*")
			context.Header("Access-Control-Allow-Origin", "http://127.0.0.1:8080") // 设置允许访问所有域: *
			context.Header("Access-Control-Allow-Methods", "POST, GET, 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-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.Header("Access-Control-Allow-Credentials", "false")
			context.Set("content-type", "application/json") //// 设置返回格式是json
		}
		if method == "OPTIONS" {
			context.JSON(http.StatusOK, "Options Request!")
		}

		// 处理请求
		context.Next()
	}
}