def uri(addr = nil, absolute = true, add_script_name = true)
      return addr if addr =~ /\A[A-z][A-z0-9\+\.\-]*:/
      uri = [host = ""]
      if absolute
        host << "http#{'s' if request.secure?}://"
        if request.forwarded? or request.port != (request.secure? ? 443 : 80)
          host << request.host_with_port
        else
          host << request.host
        end
      end
      uri << request.script_name.to_s if add_script_name
      uri << (addr ? addr : request.path_info).to_s
      File.join uri
    end
def uri(addr = nil, absolute = true, add_script_name = true)
      return addr if addr =~ /\A[A-z][A-z0-9\+\.\-]*:/
      uri = [host = ""]
      if absolute
        host << "http#{'s' if request.secure?}://"
        if request.forwarded? or request.port != (request.secure? ? 443 : 80)
          host << request.host_with_port
        else
          host << request.host
        end
      end
      uri << request.script_name.to_s if add_script_name
      uri << (addr ? addr : request.path_info).to_s
      File.join uri
    end
Generates the absolute URI for a given path in the app.
 Takes Rack routers and reverse proxies into account.