code: public HttpHeaders add(CharSequence name, Iterable<?> values) {
          return add(name.toString(), values);
      }
docs: Adds a new header with the specified name and values.
  
  This getMethod can be represented approximately as the following code:
  <pre>
  for (Object v: values) {
  if (v == null) {
  break;
  }
  headers.add(name, v);
  }
  </pre>
  
  @param name The name of the headers being set
  @param values The values of the headers being set
  @return {@code this}