okhttp教程
http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0106/2275.html
okhttp3解析
https://blog.csdn.net/u012124438/article/details/54236967
okhttp的使用：
https://blog.csdn.net/fightingXia/article/details/70947701
okhttp解析，及封装
https://blog.csdn.net/lmj623565791/article/details/47911083
vollery的用法
https://blog.csdn.net/itachi85/article/details/51043704
vollery基本用法，加载网络图片，定制request
https://blog.csdn.net/guolin_blog/article/details/17482095
vollery简介
https://blog.csdn.net/t12x3456/article/details/9221611