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Category Archives: CDN
Cloudflare 看這次 815 斷電的網路使用變化
Cloudflare 分析了這次 815 停電對網路造成的影響：「Power outage hits the island of Taiwan. Here’s what we learned.」。 以 Cloudflare 在是方機房的 QPS 來看，停電後反而沒有太大變化： 把裝置種類拆開來看，可以看到桌機的使用量下降，但手機的使用量上升： 這點從 HiNet 的使用頻寬也可以看出來，頻寬使用量降了 25% (從光世代與 ADSL/VDSL 換到行動網路上？)：
Quotient filter
之前有提過「Cuckoo Filter：比 Bloom Filter 多了 Delete」，最近在「A general purpose counting filter: making every bit count」這邊看到 Quotient filter，也是類似 Bloom filter 的資料結構，但想要解決更多問題。 一般的 Bloom filter (BF) 會有這些問題： The inability to delete items Poor scaling out of RAM The inability to resize dynamically The … Continue reading
Lambda@Edge 的 GA
AWS 的 Lambda@Edge 宣佈 GA 了：「Lambda@Edge – Intelligent Processing of HTTP Requests at the Edge」。 最直接的應用就是在 CloudFront 的 edge 上執行一小段 code，修改 HTTP request 或是 HTTP response 了，不過可以看到一些限制： 不過要用來解哪些問題要再想一下...
Telegram 使用 CDN 加速下載
Telegram 說明他們將會使用 CDN 加速：「More Speed and Security!」。 資料在 CDN 的節點上是加密的，金鑰需要透過 Telegram 的 key server 提供： While these caching nodes are only used to temporarily store public media (imagine Telegram versions of superpopular YouTube hits), all data that goes through them … Continue reading
把自己的 Blog 丟上 CloudFront
因為 CloudFront 也支援 HTTP/2 了，對於效能的衝擊應該小不少。另外當初希望多用點 IPv6，CloudFront 也支援了。最後看了一下自己的流量，每個禮拜大約 380MB 與 210K requests，也還能接受。 就把自己的 blog 再次丟上 CloudFront 玩看看，不過這次只上了 Price Class 100 (只有歐美與加拿大)。之後也許來玩看看 AWS WAF，不過開起來應該就跟 CloudFront 費用差不多了？XD 先來看看效果以及有沒有 bug 吧...
Web Cache Deception Attack
在「How (Not) to Control Your CDN」這邊看到了「Web Cache Deception Attack」這個攻擊方式。 攻擊的手法是利用網站會把 /user/personal-info/foo.css 與 /user/personal-info 視為一樣的內容時，配合 CDN 或是 reverse proxy server 會把 .css 設定無差異 cache 時，就可以在 cache server (cache edge) 取得使用者的敏感資料。 這主要是 url routing 的條件放太寬造成的。 另外 Mark Nottingham 還建議 cache 應該在 origin … Continue reading
Amazon CloudFront 又增加東京機房了...
CloudFront 又增加東京的點了，這是第四個點：「Amazon CloudFront adds new Edge Locations in Tokyo, Japan and Dallas/Fort Worth, Texas」。 This is our fourth edge location in the Tokyo area and our third in Dallas, bringing the total number of CloudFront locations to 87 (including 76 … Continue reading
Cloudflare 推出 SSL 的 SaaS 服務
Cloudflare 把之前需要人力介入的操作，包成 API 直接提供給大家用：「Introducing SSL for SaaS」。 要解決的是「用戶自己的 domain 掛到我的服務上，而且需要 HTTPS」，而 Cloudflare 提供 API 把上面三部跑完，下面的就是 Cloudflare 自己處理 (包括取得用戶的同意)：
EdgeCast 總算記得要推出 HTTP/2 了...
每次看到 EdgeCast 的業務都會抱怨一下，總算正式公佈了... EdgeCast 的 HTTP/2 預定在 2017/03/31 全面上線：「HTTP/2 Coming Soon to Our Customers with SSL Certificates!」。 由於是逐步上線，有些網站會在 3/31 前就生效 (像是 EdgeCast 的官網)： The rollout of HTTP/2 will be gradual, and you may start to see some of your content … Continue reading
分析現在還有多少不安全的 JavaScript Library 被使用
在「Thou shalt not depend on me: analysing the use of outdated JavaScript libraries on the web」這邊看到對 JavaScript Library 的研究。 jQuery 沒有什麼疑問的還是最大宗，查了一下應該是 CVE-2011-4969 的影響，對 jQuery 1.6、1.6.1、1.6.2 三個版本有影響。 另外也提到了 hosting 的部份，可以看到 Google Hosted Libraries 還是佔有最高的比率。