如何配置 Jupyterhub 以使用链证书？我有来自 Entrust 的证书：
我的名字.txt
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
Entrust_Root.txt
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
Entrust_L1Kroot.txt
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
当我尝试启动 Jupyterhub 时，出现以下错误：
crypto.js:131
c.context.setKey(options.key);
^
Error: error:0906D06C:PEM routines:PEM_read_bio:no start line
at Object.exports.createCredentials (crypto.js:131:17)
at Server (tls.js:1128:28)
at new Server (https.js:35:14)
at Object.exports.createServer (https.js:54:10)
at new ConfigurableProxy (/usr/lib/node_modules/configurable-http-proxy/lib/configproxy.js:158:35)
at Object. (/usr/lib/node_modules/configurable-http-proxy/bin/configurable-http-proxy:171:13)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
[C 2016-05-13 15:44:24.633 JupyterHub app:1119] Failed to start proxy
Traceback (most recent call last):
File "/usr/local/lib/python3.5/site-packages/jupyterhub/app.py", line 1117, in start
yield self.start_proxy()
File "/usr/local/lib/python3.5/site-packages/jupyterhub/app.py", line 881, in start_proxy
_check()
File "/usr/local/lib/python3.5/site-packages/jupyterhub/app.py", line 877, in _check
raise e
RuntimeError: Proxy failed to start with exit code 8
我的配置文件：
c.JupyterHub.ssl_cert = u'/path/to/Entrust_L1Kroot.txt'
c.JupyterHub.ssl_key = u'/path/to/my_name.txt'
我已经尝试对 ssl_cert 和 ssl_key 进行其他分配，但它们并没有更好地工作。