您的CDN预热了吗
在互联网圈里混，肯定对CDN不陌生。比如您节假日搞活动，网站上添加了很多活动海报、图片，有了CDN，页面才能秒开，生意才能做好。
不过您知道吗？源站新更新内容后，如果不做预热，首次访问请求需要回源，响应会慢得多。响应时间超过3秒，用户就会跑掉。影响了活动效果，可就太伤心了.
所谓预热，就是抢先吃螃蟹，从全球各地分别请求一遍所有新增资源，触发CDN边缘缓存，这样真实客户来的时候不用回源、响应就快了。
CloudFront是AWS的CDN服务，在全球范围以质优价廉覆盖广著称。如果您使用AWS CloudFront服务，如果您经常发布新内容，如果您在为预热烦恼，那么您可以尝试一下泰岳CDN预热工具CNDWarm：
1、可指定预热文件范围
2、可指定预热覆盖地区
3、如果源站在S3，可自动全部预热
4、提供linux和windows版本
CDNWarm保持了泰岳云工具的一贯特点：安装使用方便；完全免费使用。
心动的话，请戳https://www.awstweaker.com/2020/06/04/cdnwarm/，免费下载使用。
Have You Warmed Up Your CDN?
If you work in the internet industry, you're certainly familiar with CDN. For example, when you run holiday promotions and add many event posters and images to your website, CDN enables pages to load instantly, helping your business succeed.
But did you know? After updating content on the origin server, without warmup, the first access request needs to go back to the origin, making the response much slower. If response time exceeds 3 seconds, users will leave. This would negatively impact your campaign results - quite disappointing.
So-called warmup means being the first to "eat the crab" - requesting all new resources from various locations around the world to trigger CDN edge caching, so when real customers arrive, they don't need to go back to the origin and the response is faster.
CloudFront is AWS's CDN service, known globally for its quality, affordability, and wide coverage. If you use AWS CloudFront service, if you frequently publish new content, if you're troubled by warmup issues, then you can try Ultrapower's CDN warmup tool CDNWarm:
1. Can specify warmup file range
2. Can specify warmup coverage regions
3. If origin is on S3, can automatically warmup all content
4. Provides Linux and Windows versions
CDNWarm maintains the consistent features of Ultrapower Cloud tools: easy to install and use; completely free to use.
Interested? Click https://www.awstweaker.com/2020/06/04/cdnwarm/ to download and use for free.