&ot;:&ot;网关或代理服务器从上游服务器收到的响应无效&ot;,

&ot;503&ot;:&ot;服务器暂时无法处理该请求&ot;,

&ot;504&ot;:&ot;在等待上游服务器响应时，网关或代理服务器超时&ot;,

&ot;505&ot;:&ot;服务器不支持请求中所用的 http 版本&ot;,

&ot;1&ot;:&ot;无法解析服务器的 dns 地址&ot;,

&ot;2&ot;:&ot;连接失败&ot;,

&ot;-7&ot;:&ot;操作超时&ot;,

&ot;-100&ot;:&ot;服务器意外关闭了连接&ot;,

&ot;-101&ot;:&ot;连接已重置&ot;,

&ot;-102&ot;:&ot;服务器拒绝了连接&ot;,

&ot;-104&ot;:&ot;无法连接到服务器&ot;,

&ot;-105&ot;:&ot;无法解析服务器的 dns 地址&ot;,

&ot;-109&ot;:&ot;无法访问该服务器&ot;,

&ot;-138&ot;:&ot;无法访问网络&ot;,

&ot;-130&ot;:&ot;代理服务器连接失败&ot;,

&ot;-106&ot;:&ot;互联网连接已中断&ot;,

&ot;-401&ot;:&ot;从缓存中读取数据时出现错误&ot;,

&ot;-400&ot;:&ot;缓存中未找到请求的条目&ot;,

&ot;-331&ot;:&ot;网络已暂停&ot;,

&ot;-6&ot;:&ot;无法找到该文件或目录&ot;,

&ot;-310&ot;:&ot;重定向过多&ot;,

&ot;-324&ot;:&ot;服务器已断开连接，且未发送任何数据&ot;,

&ot;-346&ot;:&ot;收到了来自服务器的重复标头&ot;,

&ot;-349&ot;:&ot;收到了来自服务器的重复标头&ot;,

&ot;-350&ot;:&ot;收到了来自服务器的重复标头&ot;,