官方说明

按照微信公众平台，第一步微信服务器会按照公众号的设置验证我们自己的服务器，服务器需要做正确响应。

官方文档说明如下：

开发者通过检验signature对请求进行校验（下面有校验方式）。若确认此次GET请求来自微信服务器，请原样返回echostr参数内容，则接入生效，成为开发者成功，否则接入失败。加密/校验流程如下：

1）将token、timestamp、nonce三个参数进行字典序排序

2）将三个参数字符串拼接成一个字符串进行sha1加密

3）开发者获得加密后的字符串可与signature对比，标识该请求来源于微信

公众平台服务器配置

源码

实现起来比较简单

通过校验签名来确定消息合法性

def _is_weixin_msg(signature,timestamp,nonce):
       tempStr = "".join(sorted([‘token令牌字符串‘,timestamp,nonce]))
       if sha1(tempStr).hexdigest() == signature:
           return True
       else:
           return False

校验通过则直接把echostr 返回给微信服务器，握手成功

try:
            signature = request.GET.get(‘signature‘,‘‘)
            timestamp = request.GET.get(‘timestamp‘,‘‘)
            nonce = request.GET.get(‘nonce‘,‘‘)
            echostr = request.GET.get(‘echostr‘,‘‘)
           
            #print ‘1:‘,request.GET
           
            if signature is not ‘‘ and timestamp is not ‘‘ and nonce is not ‘‘:
                #签名正确
                if _is_weixin_msg(signature,timestamp,nonce):
                    return HttpResponse(echostr)
                else:
                    return HttpResponse("error")
            #普通网页浏览
            else:
                return render_to_response(‘html/index.html‘,{},context_instance=RequestContext(request))
        except:
            #print ‘except:signature-‘,signature,‘;timestamp-‘,timestamp,‘;nonce-‘,nonce,‘;echostr-‘,echostr
            return HttpResponse("error")

微信IP白名单

微信IP白名单获取比较简单，用https get方法‘api.weixin.qq.com/cgi-bin/getcallbackip?access_token=xxxxxxxx到微信服务器获取即可。

通过白名单也可以判断消息来源是否合法。另外access_token是微信服务器颁发给应用服务器的全局令牌，有其时效性，下一节介绍token的获取和更新。

部分源码

#get消息到微信服务器   
def https_get(url):
    try:
        conn = httplib.HTTPSConnection(wxHost)
        conn.request(‘GET‘,url,None,headers_get)
        response = conn.getresponse()
        backdata = response.read(5000)
        errorcode,result = response_handle(backdata)
        #{"access_token":"ACCESS_TOKEN","expires_in":7200}
        debug(‘https_get‘,url,errorcode,result)
        #GET方法处理成功，状态判断的主要在response_handle函数中处理
        if  errorcode == ‘0‘:
            return errorcode,result
        else:
            return errorcode,‘https get方法失败‘+errorcode
    except:
        return ‘https_get except‘,‘https get方法异常‘

正常流程，微信返回的JSON数据体中，‘ip_list‘则为微信服务器的IP列表

def get_ip_list():
   
    #ip_list = []
   
    try:
        url = wxHost + ‘/cgi-bin/getcallbackip?access_token=‘ \
            + get_access_token()
        errorcode = ‘‘
        for i in range(0,harq):
            errorcode,response = https_get(url)
            #菜单创建成功
            if errorcode == ‘0‘:
                #ip_list = response.get(‘ip_list‘,{})
                #print ip_list
                return True,response.get(‘ip_list‘,{})
            #token非法，重新获取替换
            else:# errorcode == ‘40014‘ or errorcode == ‘41001‘:
                #强制获取token,备注掉，在https_get中处理
                #print ‘get_ip_list:token invalid‘
                #get_access_token(True)
                url = replace_access_token(url)
               
        return False ,errorcode
    except:
        return False,‘except‘

发送和响应数据示例

(‘https_get‘, ‘api.weixin.qq.com/cgi-bin/getcallbackip?access_token=xxxxxxxx‘, ‘0‘, {‘ip_list‘: [‘101.226.62.77‘, ‘101.226.62.78‘, ‘101.226.62.79‘, ‘101.226.62.80‘, ‘101.226.62.81‘, ‘101.226.62.82‘, ‘101.226.62.83‘, ‘101.226.62.84‘, ‘101.226.62.85‘, ‘101.226.62.86‘, ‘101.226.103.59‘, ‘101.226.103.60‘, ‘101.226.103.61‘, ‘101.226.103.62‘, ‘101.226.103.63‘, ‘101.226.103.69‘, ‘101.226.103.70‘, ‘101.226.103.71‘, ‘101.226.103.72‘, ‘101.226.103.73‘, ‘140.207.54.73‘, ‘140.207.54.74‘, ‘140.207.54.75‘, ‘140.207.54.76‘, ‘140.207.54.77‘, ‘140.207.54.78‘, ‘140.207.54.79‘, ‘140.207.54.80‘, ‘182.254.11.203‘, ‘182.254.11.202‘, ‘182.254.11.201‘, ‘182.254.11.200‘, ‘182.254.11.199‘, ‘182.254.11.198‘, ‘59.37.97.100‘, ‘59.37.97.101‘, ‘59.37.97.102‘, ‘59.37.97.103‘, ‘59.37.97.104‘, ‘59.37.97.105‘, ‘59.37.97.106‘, ‘59.37.97.107‘, ‘59.37.97.108‘, ‘59.37.97.109‘, ‘59.37.97.110‘, ‘59.37.97.111‘, ‘59.37.97.112‘, ‘59.37.97.113‘, ‘59.37.97.114‘, ‘59.37.97.115‘, ‘59.37.97.116‘, ‘59.37.97.117‘, ‘59.37.97.118‘, ‘112.90.78.158‘, ‘112.90.78.159‘, ‘112.90.78.160‘, ‘112.90.78.161‘, ‘112.90.78.162‘, ‘112.90.78.163‘, ‘112.90.78.164‘, ‘112.90.78.165‘, ‘112.90.78.166‘, ‘112.90.78.167‘, ‘140.207.54.19‘, ‘140.207.54.76‘, ‘140.207.54.77‘, ‘140.207.54.78‘, ‘140.207.54.79‘, ‘140.207.54.80‘, ‘180.163.15.149‘, ‘180.163.15.151‘, ‘180.163.15.152‘, ‘180.163.15.153‘, ‘180.163.15.154‘, ‘180.163.15.155‘, ‘180.163.15.156‘, ‘180.163.15.157‘, ‘180.163.15.158‘, ‘180.163.15.159‘, ‘180.163.15.160‘, ‘180.163.15.161‘, ‘180.163.15.162‘, ‘180.163.15.163‘, ‘180.163.15.164‘, ‘180.163.15.165‘, ‘180.163.15.166‘, ‘180.163.15.167‘, ‘180.163.15.168‘, ‘180.163.15.169‘, ‘180.163.15.170‘, ‘101.226.103.0/25‘, ‘101.226.233.128/25‘, ‘58.247.206.128/25‘, ‘182.254.86.128/25‘]})

【微信开发】1、服务器响应，与微信服务器握手

原文：http://www.cnblogs.com/inns/p/5510678.html