I/O error on GET request for “…”: ; nested exception is java.net.UnknownHostException: ****
控台显示异常：

java.net.UnknownHostException: MMORDER
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) ~[na:1.8.0_31]
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_31]
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_31]
	at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_31]
	at java.net.Socket.connect(Socket.java:538) ~[na:1.8.0_31]
	at sun.net.NetworkClient.doConnect(NetworkClient.java:180) ~[na:1.8.0_31]
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:432) ~[na:1.8.0_31]
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:527) ~[na:1.8.0_31]
	at sun.net.www.http.HttpClient.<init>(HttpClient.java:211) ~[na:1.8.0_31]
	at sun.net.www.http.HttpClient.New(HttpClient.java:308) ~[na:1.8.0_31]
	at sun.net.www.http.HttpClient.New(HttpClient.java:326) ~[na:1.8.0_31]
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1168) ~[na:1.8.0_31]
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1104) ~[na:1.8.0_31]
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:998) ~[na:1.8.0_31]
	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:932) ~[na:1.8.0_31]
	at.....

配置无异常

检查多次均无错误，初学SpringCloud，很多都不熟悉。后经查大神博客解决：
需将注入的RestTemplate加Robbin客户端负载均衡@LoadBalanced注解，此异常解决；解决原理暂未知，还在学习中