-`Content-Disposition' header. This is a standard way of specifying
-the file name used by many web dynamically generated pages.
+`Content-Disposition' header. This is a standard way of specifying the
+file name used by many web dynamically generated pages. For the time
+being, Content-Disposition is not used by default, to avoid the extra
+round-trips incurred (must specify "-e contentdisposition=yes"); this
+may change in a future version.