cdn概念
CDN通过广泛的网络节点分布，提供快速、稳定、安全、可编程的全球内容分发加速服务，支持将网站、音视频、下载等内容分发至接近用户的节点，使用户可就近取得所需内容，提高用户访问的响应速度和成功率（阿里云产品介绍）。
对于海外服务器，网上介绍的CDN服务商基本就cloudflare，imperva，和亚马逊的cloudfront。cloudfront支持S3存储桶和自定义源域名，配置起来也很方便。国内貌似也有支持CDN加速的服务商，不过节点可能没有那么多。
具体配置
登录AWS后，搜索CloudFront，进入CloudFront控制台。点‘创建分配’。
因为绝大部分都是Web方式，感觉步骤一就挺鸡肋的（根本没得选），点‘入门’直接到步骤二
这一页看起来配置很多，其实主要就两项（AWS的特色？）：源域名，备用域名。
源域名
需要加速的源服务器的域名。注意。这个域名不能和提供给用户访问的自定义域名一样，原因参考这篇文章：AWS CloudFront / 亚马逊CDN使用教程 – 2206 – 博客园
有S3存储桶的直接在列表里选择，直接输入域名就是自定义的，路径非必选。
另外协议选了https或匹配查看器的话，源域名也要配置nginx的ssl证书
备用域名
如果需要通过自定义域名访问（如：http://res.example.com），就要填写备用域名，导入自定义ssl证书，或使用ACM公用证书。 这一步会将路由指向CloudFront生成的域名，还需再去route53配置CNames指向生成的dxxxxxxxxx.cloudfront.net
创建完毕后，也可以直接使用CloudFront随机生成的域名：dxxxxxxxxx.cloudfront.net
如果是用https访问，要选择自定义域名对应的ssl证书。
如果是网页应用，默认根对象（类似主页）也可以配置一下。
点击‘创建分配’，等到状态变为‘已部署’，就可使用CDN加速了。
验证效果
先向源服务器上传一张高清大图，然后用postman请求
未开启CDN加速：
开启CDN加速后：
也可以直接用浏览器验证，不过记得先清一下浏览器缓存，不然看不出效果
无CDN加速：
加速后：
查看ip地址，确实不再是从源服务器请求资源
总结
对于网站，音视频，下载类应用，CDN可以很好的提速，但是如果是提供api接口，逻辑算法类应用，CDN并不适用。
原文链接：https://blog.csdn.net/qq_42760638/article/details/116919205?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522165918321816782388050817%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=165918321816782388050817&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_ecpm_v1~times_rank-12-116919205-null-null.nonecase&utm_term=cdn
原创文章，作者：优速盾-小U，如若转载，请注明出处：https://www.cdnb.net/bbs/archives/168
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