In the process of development, it is often necessary to interact with other systems, so it is often the interfaces provided by other systems for us to call
After the development is completed, it is obvious that the local development environment is connected, but it cannot be adjusted when it is placed in the development or test environment
Check:
1. It may be that the network is blocked, and the test server of your own cannot be pinged with the test server of the other party.
Processing: Ping the other party's server on your own server
2. We can use the curl command to test that the interface is tunable
Reference: http://www.cnblogs.com/sunshine2016/p/6015976.html