title: raw string in post request body using retrofit
body: <p>i want to send user:user in the <strong>post request</strong> body. I am using <strong>retrofit</strong> lib. please suggest me.</p>
  
  <p>I have tried already like this </p>
  
  <pre><code>@POST(/login)
  void login(@BODY String s,Callback&lt;LoginResponse&gt;)
  </code></pre>
  
  <p>And called this as</p>
  
  <p><code>login("user:user",Callback&lt;LoginResponse&gt;)</code></p>