Python script - How to set the right server, when I perform request/open of application

Python 3.2.2, I want to check HTTP status code (eg. 200 or 404) on some www application.

There are five servers and each server have a copy of this www application

(The user is automatically redirected to the application on the server with low traffic/sometimes on random server).

Suppose that the name of servers is: 0,1,2,3,4

I tried various options i have tried, three of them I pasted below (they works -always return 200, but choose not this server what I want):

1

import urllib.request,urllib.parse, http.cookiejar
 values2= {"server":"2"}
 data2 = urllib.parse.urlencode(values2)
 data2 = data2.encode("utf-8")
 request2 = urllib.request.Request(url,data2)
 cj2 = http.cookiejar.CookieJar()
 cj2.add_cookie_header(request2)
 urlOpener2 = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj2))
 url2 = urlOpener2.open(request2)
 x2 = url2.getcode()
 

2

import urllib.request
 headers1 = {"Set-Cookie":"server=2"}
 req1 = urllib.request.Request(url, None, headers1)
 t1 = urllib.request.urlopen(req1)
 coderesp1 = t1.getcode()
 

3

import urllib.request
 urlOpener3 = urllib.request.build_opener()
 urlOpener3.addheaders.append(("Set-Cookie", "server=2"))
 url3 = urlOpener3.open(url)
 x3 = url3.getcode()
 

If you have some questions about my problem, please write, I will immediately reply to what you want to know.

---