import gzip
import urllib2
from io import BytesIO

r = urllib2.urlopen(urllib2.Request('http://stackoverflow.com', 
                    headers={'Accept-Encoding': 'gzip;q=1.0, *;q=0'}))
print r.info()
s = r.read()
print("comressed size: %d" % len(s))

f = gzip.GzipFile(fileobj=BytesIO(s))
print("uncompressed: %d" % len(f.read()))