code: public static <K, V> String getAsString(Headers<K, V, ?> headers, K name) {
          V orig = headers.get(name);
          return orig != null ? orig.toString() : null;
      }
docs: {@link Headers#get(Object)} and convert the result to a {@link String}.
  @param headers the headers to get the {@code name} from
  @param name the name of the header to retrieve
  @return the first header value if the header is found. {@code null} if there's no such entry.