code: protected Map<String, List<String>> decodeParameters(
              Map<String, String> parms) {
          return this.decodeParameters(parms.get(QUERY_STRING_PARAMETER));
      }
docs: Decode parameters from a URL, handing the case where a single parameter
  name might have been supplied several times, by return lists of values.
  In general these lists will contain a single element.
  
  @param parms
  original <b>NanoHttpd</b> parameters values, as passed to the
  <code>serve()</code> method.
  @return a map of <code>String</code> (parameter name) to
  <code>List&lt;String&gt;</code> (a list of the values supplied).