CDN
CDN(Content Delivery/Distribution Network) 內容傳遞網路
- 快取網頁、圖片、影片至距離使用者最近的伺服器
- 對網站發送請求時,會先到CDN獲取,如果沒有才會到實際網站伺服器發送請求。
- 可以分散到網站伺服器的流量,防止DDos攻擊
供應商:
Akamai(阿卡邁科技), Amazon CloudFront, Cloudflare, Fastly, Google雲端平台, 藍汛, Microsoft Azure, 網宿科技, 阿里雲, 騰訊雲, 百度雲
DNS Records
- txt: Is used to prove ownership of the domain.
- mx(mail exchange): Is used to receive emails from external domains.
- cname: Is used to alias one domain name to another.
Storage
| Cookies | Local Storage | Session Storage | |
|---|---|---|---|
| Capacity | 4kb | 10mb | 5mb |
| Browser | HTML 4/5 | HTML 5 | HTML 5 |
| Accessible from | Any Windows | Any Windows | Same tab |
| Expires | Manually set | Never | On tab close |
| Storage Location | Browser and Server | Browser only | Browser only |
| Sent with requeset | Yes | No | No |