django做微信开发后台时无法返回response

Question

views.py如下：

----------

# -*- coding: utf-8 -*-
from django.http import HttpResponse
from django.template import RequestContext, Template
from django.views.decorators.csrf import csrf_exempt
from django.utils.encoding import smart_str, smart_unicode
import xml.etree.ElementTree as ET
import urllib,urllib2,time,hashlib
import sys
import json

TOKEN = "12**56"
API_KEY = 'bc192acc7*****c19342f5f0274'

@csrf_exempt
def handleRequest(request):
    if request.method == 'GET':
        response = HttpResponse(checkSignature(request),content_type="text/plain")
        return response
    elif request.method == 'POST':
        response = HttpResponse(responseMsg(request),content_type="application/xml")
        return response
    else:
        return None

def checkSignature(request):
    global TOKEN
    signature = request.GET.get("signature", None)
    timestamp = request.GET.get("timestamp", None)
    nonce = request.GET.get("nonce", None)
    echoStr = request.GET.get("echostr",None)

    token = TOKEN
    tmpList = [token,timestamp,nonce]
    tmpList.sort()
    tmpstr = "%s%s%s" % tuple(tmpList)
    tmpstr = hashlib.sha1(tmpstr).hexdigest()
    if tmpstr == signature:
        return echoStr
    else:
        return None

def responseMsg(request):
    #解析微信客户端传来的XML的Post信息
    rawStr = smart_str(request.request.body)
    msg = paraseMsgXml(ET.fromstring(rawStr))
    queryStr = msg.get('Content','You have input nothing~')
    raw_TULINURL = "http://www.tuling123.com/openapi/api?key=%s&info=" % API_KEY
    TULINURL = "%s%s" % (raw_TULINURL,urllib2.quote(queryStr))
    req = urllib2.Request(url=TULINURL)
    result = urllib2.urlopen(req).read()
    hjson=json.loads(result)
    length=len(hjson.keys())
    content=hjson['text']
    if length==3:
        replyContent= 'robots:' +content+hjson['url']
    elif length==2:
        replyContent= 'robots:' +content
    else:
        return "please input again."
    return getReplyXml(msg,replyContent)

def paraseMsgXml(rootElem):
    msg = {}
    if rootElem.tag == 'xml':
        for child in rootElem:
            msg[child.tag] = smart_str(child.text)
        return msg

def getReplyXml(msg,replyContent):
    extTpl = '''<xml><ToUserName><![CDATA[%s]]></ToUserName><FromUserName><![CDATA[%s]]></FromUserName><CreateTime>%s</CreateTime><MsgType><![CDATA[%s]]></MsgType><Content><![CDATA[%s]]></Content><FuncFlag>0</FuncFlag></xml>''';
    extTpl = extTpl % (msg['FromUserName'],msg['ToUserName'],str(int(time.time())),'text',replyContent)
    return extTpl