class WEBrick::HTTPServlet::FileHandler

def trailing_pathsep?(path)
  # check for trailing path separator:
  #   File.dirname("/aaaa/bbbb/")      #=> "/aaaa")
  #   File.dirname("/aaaa/bbbb/x")     #=> "/aaaa/bbbb")
  #   File.dirname("/aaaa/bbbb")       #=> "/aaaa")
  #   File.dirname("/aaaa/bbbbx")      #=> "/aaaa")
  return File.dirname(path) != File.dirname(path+"x")
end