APEX PDF Printing II and ORA-20001 "Printing Engine"

If you use APEX PDF printing with an 11G database, make sure you configure the acl. 11G does NOT allow alless to the www by default!
When you run into this error:

ORA-20001: The printing engine could not be reached because either the URL specified is incorrect or a proxy URL needs to be specified

Then, try this:

BEGIN
DBMS_NETWORK_ACL_ADMIN.CREATE_ACL(acl => 'www.xml',
description => 'ACL for ApEx Printing',
principal => 'APEX_040100'
is_grant => true,
privilege => 'connect');

DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE(acl => 'www.xml',
principal => 'APEX_040100',
is_grant => true,
privilege => 'resolve');

DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL(acl => 'www.xml',
host => 'your.FOP.host.here');
END;
/
COMMIT;