该jar包为源码httpclient-4.5.6更新包名后的jar包。为了解决android org.apache.http.legacy 包已有的http和httpclient4.3以上版本冲突。使用时将 org.apache.http包下的资源替换成
org.apache.http4即可。如：
import org.apache.http4.client.HttpClient;
import org.apache.http4.client.config.RequestConfig;
import org.apache.http4.client.methods.HttpPost;
