url = 'http://localhost/testing/posting.php'
data = (
    """subject=Alice-subject&addbbcode18=%23444444&addbbcode20=0&helpbox=Close+all+open+bbCode+tags&message=alice-body&poll_title=&add_poll_option_text=&poll_length=&mode=newtopic&sid=5b2e663a3d724cc873053e7ca0f59bd0&f=1&post=Submit"""
    )
cookie = (
    """phpbb2mysql_data=a%3A2%3A%7Bs%3A11%3A%22autologinid%22%3Bs%3A0%3A%22%22%3Bs%3A6%3A%22userid%22%3Bs%3A1%3A%223%22%3B%7D; phpbb2mysql_t=a%3A9%3A%7Bi%3A3%3Bi%3A1330156986%3Bi%3A1%3Bi%3A1330160737%3Bi%3A5%3Bi%3A1330161702%3Bi%3A6%3Bi%3A1330179284%3Bi%3A2%3Bi%3A1330160743%3Bi%3A7%3Bi%3A1330163187%3Bi%3A8%3Bi%3A1330164442%3Bi%3A9%3Bi%3A1330164739%3Bi%3A10%3Bi%3A1330176335%3B%7D; phpbb2mysql_sid=5b2e663a3d724cc873053e7ca0f59bd0"""
    )
urlparts = urlparse(url)
conn = HTTPConnection(urlparts.netloc, urlparts.port or 80)
conn.request('POST', urlparts.path, data, {'Cookie': cookie})
resp = conn.getresponse()
body = resp.read()
How to make a Python HTTP Request with POST data and Cookie?