title: call second Retrofit request after getting response of first request
body: <p>First Request : <strong>ReceiveNewDataFromServer()</strong></p>
  
  <p>Second Request: <strong>SendNewDataToServer()</strong></p>
  
  <p>Currently both request sending parallely with successful response but getting <strong>sometimes conflict with data.</strong></p>
  
  <p>Is there any solution to Request one after another?</p>
  
  <p>P.S. I am thinking to put second request in "success" callback of first, but may that will take more time.</p>