test Last-Modified.py

# test Last-Modified.py
import urllib2,httplib
url="http://cmyip.com"
request=urllib2.Request(url)
opener=urllib2.build_opener()
firstdatastream=opener.open(request)
print repr(firstdatastream.headers.__dict__)
request.add_header("If-Modified-Since",
firstdatastream.headers.get("Last-Modified"))
seconddatastream=opener.open(request)
print repr(seconddatastream.headers.__dict__)