force a particular L<PerlIO> layer. If neither are found the filehandle is
set to :raw.
-This is useful if you are pulling the file into code and inspecting bit and
-maybe then sending those bits back as the response. (Please not this is not
+This is useful if you are pulling the file into code and inspecting bits and
+maybe then sending those bits back as the response. (Please note this is not
a suitable filehandle to set in the body; use C<fh> if you are doing that).
Please note that using this method sets the underlying filehandle IO layer