@Override
      public Integer length() {
        return length;
      }
This module directs Feign's http requests to
<a href="http://square.github.io/okhttp/">OkHttp</a>, which enables SPDY and better network
control. Ex.

<pre>
GitHub github = Feign.builder().client(new OkHttpClient()).target(GitHub.class,
"https://api.github.com");
okhttp/src/main/java/feign/okhttp/OkHttpClient.java