docs: static boolean isEndToEnd(String fieldName) {
      return !"Connection".equalsIgnoreCase(fieldName)
          && !"Keep-Alive".equalsIgnoreCase(fieldName)
          && !"Proxy-Authenticate".equalsIgnoreCase(fieldName)
          && !"Proxy-Authorization".equalsIgnoreCase(fieldName)
          && !"TE".equalsIgnoreCase(fieldName)
          && !"Trailers".equalsIgnoreCase(fieldName)
          && !"Transfer-Encoding".equalsIgnoreCase(fieldName)
          && !"Upgrade".equalsIgnoreCase(fieldName);
    }