As SYS User:
BEGIN
DBMS_NETWORK_ACL_ADMIN.CREATE_ACL(acl => '<NAME>.xml',
description => Http-Access',
principal => '<USERNAME>',
is_grant => true,
privilege => 'connect');
DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE(acl => '<NAME>.xml',
principal => '<USERNAME>',
is_grant => true,
privilege => 'resolve');
DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL(acl => '<NAME>.xml',
host => '<HTTP-SERVER>');
END;