缓存 Key 生成规则: 协议 + 方法 + 域名 + 路径
文件路径规则: /data3/cache-oss/[倒数第1位]/[倒数第2-3位]/[MD5完整值]
示例:
URL: https://demo/2273bb4e94f72b36c391c4f1d3f3f227.txt
缓存Key: httpsGETdemo/2273bb4e94f72b36c391c4f1d3f3f227.txt
MD5: 04b44976ecdc40e3668c87d4b7442b05
路径: /data3/cache-oss/5/b0/04b44976ecdc40e3668c87d4b7442b05