UCloud平台为国内开发者提供了以下域名的免费加速，无需任何配置即可使用。
云主机上无需额外配置，在访问以下域名时即可实现访问加速：
| 分类 | 域名 |
|---|---|
| github | github.com |
| *.github.com | |
| gist.githubusercontent.com | |
| raw.githubusercontent.com | |
| dingtalk | *.trans.dingtalk.com |
| trans.dingtalk.com | |
| zjk-cdn-trans.dingtalk.com | |
| sh-cdn-trans.dingtalk.com | |
| sz-cdn-trans.dingtalk.com | |
| baidu.com | *.pcs.baidu.com |
| pcs.baidu.com | |
| *.baidupcs.com | |
| baidupcs.com | |
| nvidia | developer.download.nvidia.com |
| nvcr.io | |
| *.nvcr.io | |
| helm.ngc.nvidia.com | |
| *.ngc.nvidia.com | |
| docker | download.docker.com |
| go | golang.org |
| go.googlesource.com | |
| python | files.pythonhosted.org |
| 其他 | conda.anaconda.org |
| conda.io | |
| repo.anaconda.com |
测试数据如下，可实现百倍级别的加速。
加速前带宽10KB/s-50KB/s范围内。
[root@192-168-6-90 ~]# git clone https://github.com/dgraph-io/dgraph.git
Cloning into 'dgraph'...
remote: Enumerating objects: 162, done.
remote: Counting objects: 100% (162/162), done.
remote: Compressing objects: 100% (137/137), done.
Receiving objects: 10% (10713/98227), 5.32 MiB | 27.00 KiB/s
加速后带宽可至1MB/s-10MB/s范围内。
[root@192-168-6-90 ~]# git clone https://github.com/dgraph-io/dgraph.git
Cloning into 'dgraph'...
remote: Enumerating objects: 140, done.
remote: Counting objects: 100% (140/140), done.
remote: Compressing objects: 100% (118/118), done.
remote: Total 98205 (delta 60), reused 46 (delta 22), pack-reused 98065
Receiving objects: 100% (98205/98205), 436.16 MiB | 4.32 MiB/s, done.
主机上无需做额外配置，执行dig github.com时，会发现解析出一个内网IP地址，这是专门为实现域名加速而提供的服务地址。
dig github.com
...
;; ANSWER SECTION:
github.com. 312 IN A 10.10.211.68
...
以GitHub实现为例，clone代码时有两种方法，HTTPS和SSH。TSL/SSL加密在客户端和GitHub服务器之间进行，每个连接会生成唯一的加密密钥，且传输的内容是经过完整性校验，客户端会对服务端的主机名和证书进行有效性验证。SSH使用公私钥对进行认证和加密传输，客户端到GitHub服务端的连接是基于非对称加密，实现端到端的加密传输。