real_lighttpd_workaround.rb

# Lighttpd sets the wrong SCRIPT_NAME and PATH_INFO if you mount your
# FastCGI app at "/". This middleware fixes this issue. This is also
# modified to account for the case when SCRIPT_NAME is the name of the
# 404 script
class LightyWorkaround
  def initialize(app)
    @app = app
  end

  def call(env)
    uri, qs = env["REQUEST_URI"].to_s.split('?')
    @app.call(env.merge("PATH_INFO" => uri, "QUERY_STRING" => (qs || ''), "SCRIPT_NAME" => ""))
  end
end