Django開發微信公眾號無法回復消息

需求

用Django開發一個公眾號，實現的功能是用戶發一條文本消息，我直接返回回去
#代碼
我的代碼如下：

views.py

# 微信調用測試使用
class WeixinInterfaceView(View):
    def get(self, request):
        # 得到GET內容
        signature = request.GET.get('signature', None)
        timestamp = request.GET.get('timestamp', None)
        nonce = request.GET.get('nonce', None)
        echostr = request.GET.get('echostr', None)
        # 自己的token
        token = 'SvenWeng'  # 這裡改寫你在微信公眾平台裡輸入的token
        # 字典序排序
        tmpList = [token, timestamp, nonce]
        tmpList.sort()
        tmpstr = '%s%s%s' % tuple(tmpList)
        # sha1加密算法
        tmpstr = hashlib.sha1(tmpstr).hexdigest()

        # 如果是來自微信的請求，則回復echostr
        if tmpstr == signature:
            return render(request, 'get.html', {'str': echostr},
                          content_type='text/plain')

    def post(self, request):
        # str_xml = request.body.decode('utf-8')  # use body to get raw data
        str_xml = smart_str(request.body)
        xml = etree.fromstring(str_xml)  # 進行XML解析
        toUserName = xml.find('ToUserName').text
        fromUserName = xml.find('FromUserName').text
        createTime = xml.find('CreateTime').text
        msgType = xml.find('MsgType').text
        content = xml.find('Content').text  # 獲得用戶所輸入的內容
        msgId = xml.find('MsgId').text
        return render(request, 'reply_text.xml',
                      {'toUserName': toUserName,
                       'fromUserName': fromUserName,
                       'createTime': time.time(),
                       'msgType': msgType,
                       'content': content,
                       },
                      content_type='application/xml'
                      )

reply_text.xml

<xml>
<ToUserName><![CDATA[{{ toUserName }}]]></ToUserName>
<FromUserName><![CDATA[{{ fromUserName }}]]></FromUserName>
<CreateTime>{{ createTime }}</CreateTime>
<MsgType><![CDATA[{{ msgType }}]]></MsgType>
<Content><![CDATA[{{ content }}]]></Content>
</xml>

urls.py

urlpatterns = [
    url(r'^admin/', include(admin.site.urls)),
    url(r'^grzx/', include('MyBlog.urls', namespace='grzx')),
    url(r'^', include('MyBlog.urls')),
    url(r'^weixin/', csrf_exempt(WeixinInterfaceView.as_view())),
]
urlpatterns += staticfiles_urlpatterns()

我使用測試工具受到返回的結果是這樣的

<xml>
<ToUserName><![CDATA[diandianweizixun]]></ToUserName>
<FromUserName><![CDATA[wyb199026]]></FromUserName>
<CreateTime>1452836946.28</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[111111111]]></Content>
</xml>

我這個返回和微信的開發文檔要求是一樣的，為什麼我在公眾號上回復提示暫時無法服務？附上微信測試工具返回的結果

請求地址：http://www.ddhbblog.sinaapp.com/weixin/

Connection: keep-alive
Date: Fri, 15 Jan 2016 05:50:13 GMT
Transfer-Encoding: chunked
Set-Cookie: saeut=CkMPGlaYiJVgTmYsBOEuAg==; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/
Via: yq26.pyruntime
Server: nginx
Content-Type: application/xml
<xml>
    <ToUserName>
        <![CDATA[diandianweizixun]]>
    </ToUserName>
    <FromUserName>
        <![CDATA[wyb199026]]>
    </FromUserName>
    <CreateTime>1452837013.23</CreateTime>
    <MsgType>
        <![CDATA[text]]>
    </MsgType>
    <Content>
        <![CDATA[12312312]]>
    </Content>
</xml>

求大神指點迷津

最佳回答：

https://www.zhihu.com/question/34501713/answer/60667535