title: Can't convert Map<String, List<String>> to Map<String, Iterable<String>>
body: <p>Hi I have quiet a simple code that returns me an error </p>
  
  <pre><code>    void changeHeaders(HttpURLConnection url){
          Map&lt;String, Iterable&lt;String&gt;&gt; m ;
          m = url.getHeaderFields();//&lt;-- this line gives an error
          ...
      }
  </code></pre>
  
  <p>The error is: <code>Type mismatch: cannot convert from Map&lt;String,List&lt;String&gt;&gt; to Map&lt;String,Iterable&lt;String&gt;&gt;</code></p>
  
  <p>Why I can not convert List to Iterable?</p>