Came across an old announcement for a product called "Mammoth S/JDBC" that claimed to have "support for compressed connection streams" [http://archives.postgresql.org/pgsql-announce/2003-04/msg00010.php]. Looking for the product page, I found that "S/JDBC was discontinued as the Open Source version reached the same capability level " [http://www.commandprompt.com/products/tips]. That's good news -- but I couldn't find any mention of such a feature in the documentation [http://jdbc.postgresql.org/documentation/head/]?
pgsql-jdbc by date:
Соглашаюсь с условиями обработки персональных данных