python client使用 http post 到server端

import urllib, httplib
import utils
import json

class User:

    def __init__(self):
        print 'a'
    
    def login(self, imsi, ua):
        print "==============user start login=================="
        input = {
            "method"       : "user.login",
            "userName"     : "",
            "userPass"     : "",
        }
        
        input["sig"] = utils.getSignature(input)
        params = urllib.urlencode(input)
        headers = {
            "user-agent"  : ua,
            "Appstore-clientType" : "android",
            "Appstore-IMEI" : "123456789000000",
            "Appstore-IMSI" : imsi
        }
    
        try:
            connection = httplib.HTTPConnection(utils.API_HOST)
            connection.request("POST", "/api", params, headers)
            response = connection.getresponse().read()
            #print "=========" + response
            connection.close()
        except Exception, e :
            print "========" + str(e)    
        
        if "errorcode" in response or response is None:
            return
        
        results = json.loads(response)    
        
        return results["results"].encode("utf-8")