code: public static JwsHeader jwsHeader(Map<String, Object> header) {
          return Classes.newInstance("io.jsonwebtoken.impl.DefaultJwsHeader", MAP_ARG, header);
      }
docs: Returns a new {@link JwsHeader} instance suitable for digitally signed JWTs (aka 'JWS's), populated with the
  specified name/value pairs.
  
  @return a new {@link JwsHeader} instance suitable for digitally signed JWTs (aka 'JWS's), populated with the
  specified name/value pairs.
  @see JwtBuilder#setHeader(Header)