这是一个对于4.5版的bug修复的维护性的发布。
Release 4.5.1 ------------------- HttpClient 4.5.1 (GA) is a maintenance release that fixes a number of minor defects found since 4.5. Please note that as of 4.4 HttpClient requires Java 1.6 or newer. Changelog: ------------------- * [HTTPCLIENT-1680] redirect of a POST request causes ClientProtocolException. Contributed by Oleg Kalnichevski <olegk at apache.org> * [HTTPCLIENT-1673] org.apache.http.entity.mime.content.* missing from OSGi exports. Contributed by Benson Margulies <benson at basistech.com> * [HTTPCLIENT-1668] Fluent request incorrectly handles connect timeout setting. Contributed by Oleg Kalnichevski <olegk at apache.org> * [HTTPCLIENT-1667] RequestBuilder does not take charset into account when creating UrlEncodedFormEntity. Contributed by Sergey Smith <smithsv at bk.ru> * [HTTPCLIENT-1655] HttpClient sends RST instead of FIN ACK sequence when using non-persistant connections. Contributed by Oleg Kalnichevski <olegk at apache.org>
http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.5.x.txt
这个货，一个版本直接把上个版本的大部分功能都给@Deprecated
没事就不要折腾升级玩了
AsyncHttpclient还可以玩一玩
引用来自“西夏一品堂”的评论
这个东西和http client是什么关系