a virtual server here can speed up Web performance.
path: URL path, relative to the server, to find files. Defaults to
main path + '/file/'.
+ssl: whether to use HTTPS for file URLs. Defaults to null, meaning to
+ guess based on other SSL settings.
filecommand: command to use for determining the type of a file. May be
skipped if fileinfo extension is installed. Defaults to
'/usr/bin/file'.
subdir of install dir.
path: path to backgrounds. Default is sub-path of install path; note
that you may need to change this if you change site-path too.
+ssl: Whether or not to use HTTPS for background files. Defaults to
+ null, meaning to guess from site-wide SSL settings.
ping
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