ftp和http区别
https://blog.csdn.net/only_musm/article/details/78983364?spm=1001.2101.3001.6650.4&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-4-78983364-blog-123458009.235%5Ev28%5Epc_relevant_default&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-4-78983364-blog-123458009.235%5Ev28%5Epc_relevant_default&utm_relevant_index=9