10. Glossary
| English Term | Chinese Translation | Explanation |
|---|---|---|
| Object Storage | 对象存储 | A data storage architecture that manages data as objects rather than a file system hierarchy. Suitable for storing images, videos, backups, and other unstructured data. |
| Bucket | 存储桶 | The top-level container in object storage for organizing and isolating data. Each bucket has independent permission controls and configuration. |
| Object | 对象/文件对象 | The basic unit of object storage, consisting of the data itself, metadata, and a globally unique key. |
| CDN | 内容分发网络 | Content Delivery Network. Accelerates access by deploying edge nodes globally to cache website content closer to users. |
| Edge Node | 边缘节点 | Cache servers deployed across regions in a CDN network, directly serving content to users. |
| Origin | 源站 | The server from which a CDN fetches content on a cache miss. Can be object storage, ECS, or a self-managed server. |
| Cache Hit | 缓存命中 | The requested content already exists on the CDN edge node and is returned directly without fetching from origin. |
| Cache Miss | 缓存未命中 | The edge node does not have the requested content and must fetch it from the origin. |
| Hit Ratio | 命中率 | The proportion of cache hits to total requests. Higher hit ratio means fewer origin fetches and lower costs. |
| TTL | 生存时间/缓存时间 | Time To Live. The validity period of content cached on a CDN node. After expiration, it must be re-fetched from the origin. |
| Back to Source | 回源 | The process of a CDN edge node requesting content from the origin. |
| Purge/Refresh | 刷新缓存 | Force CDN cache invalidation so the next request fetches the latest content from the origin. |
| Preheat | 预热 | Proactively push content to CDN nodes before official release, so users hit the cache on their first visit. |
| CORS | 跨域资源共享 | Cross-Origin Resource Sharing. A browser security mechanism that controls resource access between different domains. |
| Referer | 来源页面 | An HTTP request header field indicating which page the request was linked from. Used for hotlink protection. |
| STS | 安全令牌服务 | Security Token Service. A service that issues temporary access credentials, used for scenarios like frontend direct upload. |
| Multipart Upload | 分片上传 | Splitting a large file into multiple chunks for parallel upload, supporting resumable uploads for improved efficiency and reliability. |
| ETag | 实体标签 | An HTTP response header used to identify a specific version of a resource, commonly used for cache validation. |
| S3 API | S3 兼容接口 | AWS S3's object storage API specification, which most cloud providers' object storage services are compatible with. |
| Canonical Query String | 规范查询字符串 | Part of the signature string used to compute request signatures, ensuring requests are not tampered with. |