Can not add any API

I want to add an API for http://ookong.com. It passes API test, but fails at proxy test. The following are the results from validation page.

Results

API Test:
HTTP Response: 200 | Round-trip time: 354 ms
Proxy Test:
HTTP Response: NA | Round-trip time: NA

API/ Proxy is Invalid.Reason: Cannot Connect , please check the hostname
Inappropriate?
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