@Override
  public feign.Response execute(feign.Request input, feign.Request.Options options)
      throws IOException {
    okhttp3.OkHttpClient requestScoped = getClient(options);
    Request request = toOkHttpRequest(input);
    Response response = requestScoped.newCall(request).execute();
    return toFeignResponse(response, input).toBuilder().request(input).build();
  }
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