title: How to use OKHTTP to make a post request?
body: <p>I read some examples which are posting jsons to the server.</p>
  
  <p>some one says :</p>
  
  <blockquote>
    <p>OkHttp is an implementation of the HttpUrlConnection interface
    provided by Java. It provides an input stream for writing content and
    doesn't know (or care) about what format that content is.</p>
  </blockquote>
  
  <p>Now I want to make a normal post to the URL with params of name and password.</p>
  
  <p>It means I need to do encode the name and value pair into stream by myself?</p>