The error is caused by private static final boolean USE_CANONICAL_HOSTNAME = true; in https://github.com/apache/calcite-avatica/blob/73fac75befaaf3caa3871656d0d0b7adbd91f7cf/core/src/main/java/org/apache/calcite/avatica/remote/AvaticaCommonsHttpClientSpnegoImpl.java#L58
In other words, httpclient is using the "canonical hostname" when sending the request rather than localhost. I guess the property should be configurable via connection URL. I've added -D for now. CI is OK, and it would be great if someone could create a connection parameter for configuring the use of "canonical hostname". Vladimir
