title: Get a request parameter key-value in fasthttp
body: <p><a href="http://127.0.0.1:8080/x?haha=1" rel="nofollow">http://127.0.0.1:8080/x?haha=1</a></p>
  
  <p>I want to get something like <code>ctx.QueryArgs().Get("haha")</code></p>
  
  <p>is it possible in golang's <code>fasthttp</code> package?</p>