org.apache.http.ProtocolException: Target host is not specified
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对于httpClient4.3访问指定页面，可以从下面的demo抽取方法使用。
注意：对于URL必须使用 http://开始，否则会有如下报错信息：
Caused by: org.apache.http.ProtocolException: Target host is not specified
at org.apache.http.impl.conn.DefaultRoutePlanner.determineRoute(DefaultRoutePlanner.Java:69)
at org.apache.http.impl.client.InternalHttpClient.determineRoute(InternalHttpClient.java:124)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:183)
... 5 more
2 0
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