When a client try to reach an HTTP server through a propxy without prior identification, the method HttpURLConnection.getResponseCode() should return
407 (i.e. proxy authentification needed).

This works find with Java 1.1.8 and 1.4.
This does not work with 1.3.1: and IO Exception is thrown instead.

This problem has already been reported in BugParade, id 4523989. The customer would like to have it fixed in 1.3.1.