On an origin HTTP-DeleGate, a local file with suffix ".shtml" is regarded,
like a file with ".html",
as a HTML file except that it includes special tags for
Server Side Include (SSI) and META which are to be
interpreted and substituted by the HTTP-DeleGate
before it is sent to a client.
will be substituted with the value specified by varName.
varName can be arbitrary CGI compatible name like
"REMOTE_HOST" or "HTTP_SERVER",
as well as followings.
will be substituted with the data specified by "virtual" attribute.
"virtual" can be full URL like "proto://server/upath"
or partial URL like "/upath" which will be interpreted
as http://delegate/upath.
Relative URLs like "upath" without leading "/"
are interpreted as relative to the base (current) shtml file.
will be substituted with the size or the last modified time
of the specified data respectively.
<!--#config timefmt=timeFormat -->
will specify the format of generated time string by "#echo","#flastmod"
or so, in strftime(3) compatible format.
(default: timefmt="%a, %d %b %Y %H:%M:%S %z")