import re
import sys
import urllib2
import urllib
import threading

websites = []
websiteheaders = []

def logfile(websiteheaders):

    for line in websiteheaders:
        if "Server" in line:
            print line

def headerophalen(websites):

    for url in websites:
        response = urllib2.urlopen(url)
        headers = str(response.info())
        websiteheaders.append(headers)

    logfile(websiteheaders)

def main():

    hostsfile = open ("hosts.txt", "r")

    for line in hostsfile:
        websites.append("http://" + line)

    thread = threading.Thread(target=headerophalen, args=(websites,))
    thread.start()



if __name__=="__main__":

    main()