http://www.python.jp/doc/2.3.5/lib/httplib-examples.html

>>> import httplib, urllib
>>> params=urllib.urlencode({'id':1, 'imagedata':"spam"})
>>> headers={"Content-type": "application/x-www-form-urlencoded",
... "Accept": "text/plain"}
>>> conn=httplib.HTTPConnection("localhost")
>>> conn.request("POST", "/cgi-bin/upload_py.cgi", params, headers)
>>> res=conn.getresponse()
>>> res.status
500

ここを見ながら、client側の部分を書いてみたのですが
うまく行きません…どう書いたら良いでしょうか？