title: How to pass array for a POST request in HTTPBuilder
body: <p>The post request code that I use:</p>
  
  <pre><code>def http = new HTTPBuilder(uri)
  http.request(Method.POST, ContentType.TEXT){
      send ContentType.URLENC, attrs
  
      ..Response handler code...         
  }
  </code></pre>
  
  <p>here attrs is a map with the key&amp;value that needs to be passed such as:</p>
  
  <pre><code>[param1:'value1', param2:'value2', param3:'value3]
  </code></pre>
  
  <p>I need to support passing multiple values for the same parameter, hence passing as a map is not an option. What is my alternative in this case? What I need to pass:</p>
  
  <pre><code>[param1:'value1', param1:'value2', param3:'value3']
  </code></pre>