k</a> callback)
        
        <div class="jd-descrdiv">Initiates the network fetch and informs the producer when a response is received via the
 provided callback.</div>
  
  </td></tr>


	 
    <tr class="alt-color api apilevel-" >
        <td class="jd-typecol">
            abstract
            
            
            
            
            Map&lt;String,&nbsp;String&gt;
        </td>
        <td class="jd-linkcol" width="100%">
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