```bash
$ echo $NVM_NODEJS_ORG_MIRROR
http://npm.taobao.org/mirrors/node
```

``` console
1:49:25 curl: (56) SSL read: error:00000000:lib(0):func(0):reason(0), errno 104
11:49:25 Binary download from https://nodejs.org/dist/v6.9.2/node-v6.9.2.tar.xz failed, trying source.
11:49:25 grep: /root/.nvm/.cache/src/node-v6.9.2/node-v6.9.2.tar.xz: No such file or directory
11:49:25 Provided file to checksum does not exist.
11:49:25 nvm: install v6.9.2 failed!
```

I need to download node from mirror, but Jenkins still download from the official website.