R/utils.R
link_to_www.RdSymbolic links in the www subdirectory of the Shiny app are required for the application to properly display html documents or images in html tags.
link_to_www(path, link)
www_relative(path)TRUE if the symbolic link exists for link_to_www() or FALSE
otherwise. The modified path is returned by www_relative()
www_relative(): Strip www/ in front of the relative paths for a Shiny app.