def append_query(param, value)
      @query_map[param] = [] unless @query_map.key?(param)
      @query_map[param] = [@query_map[param], value].flatten
    end
def append_query(param, value)
      @query_map[param] = [] unless @query_map.key?(param)
      @query_map[param] = [@query_map[param], value].flatten
    end
Appends a parameter to the query map

 Only used internally.

 If the parameter already exists that parameter is converted to an
 array of values

 @private