Delay a request via webrick

ruby-talk
1

code :

require 'webrick/httpproxy'
class MyServer < WEBrick::HTTPProxyServer
   def do_GET(req,res)
       if res.path == a string
            sleep 30
            res.body = a string
       else
            super(req,res)
   end
end
server = MyServer.new :Port=>8000
server.start

I want to delay specific request,but it delay all request.why?how to
resolve it.

···

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