之前爬取过几个静态的网站数据，都还比较顺利，这次遇到ajax，看了几个文档，感觉不是很难，就直接上手了，但还是卡住了。。。

目标：
爬取大街网的职位信息。

过程：
1，使用浏览器审查元素功能查看数据动态加载的地址信息。

2，根据显示的信息配置requests的请求参数。

data = {
    'keyword': 'python',
    'order': '0',
    'city': '',
    'recruitType': '',
    'salary': '',
    'experience': '',
    'page': '5',
    'positionFunction': '',
    '_CSRFToken': '',
    'ajax': '1'
}
headers = {
    'accept': 'application/json, text/javascript, */*; q=0.01',
    'accept-language': 'zh-CN,zh;q=0.8',
    'accept-encoding': 'gzip, deflate, sdch',
    'cookie': 'DJ_UVID=MTQ5MDMyMTExNTAzODM2MTc5; DJ_RF=empty; DJ_EU=http%3A%2F%2Fjob.dajie.com%2F; __login_tips=1; dj_cap=9c8c95bdef72e84a9bd7493a5ab91694; USER_ACTION="request^A-^A-^Ajobdetail:^A-"; SO_COOKIE_V2=0c7cGprjIH0q9RHc53CWLLXf151DQ5QvUP5ccPQj4g0B/izuXHm8sp41lJjJJh3nmjAkroj8JczFN/SCLPAUzbOHW7wYWmQ6Zu7s',
    'referer': 'https://so.dajie.com/job/search?keyword=%E9%A3%9E%E5%88%A9%E6%B5%A6&from=job&clicktype=blank',
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36',
    'X-Requested-With': 'XMLHttpRequest',
    'method':'get'
}

3，将请求头信息添加到requests.get()中。

response = requests.get('https://so.dajie.com/job/ajax/search/filter', params=data, headers=headers)

4,查看返回的页面信息。

print response.url
print ''
print response.request.headers
print ''
print response.headers
print ''
print response.content[-1000:]
print ''
print response

5,返回的结果怎么不是期望的json数据呢。。。

response.url:
https://so.dajie.com/job/ajax/search/filter?salary=&city=&ajax=1&positionFunction=&_CSRFToken=&keyword=python&recruitType=&order=0&experience=&page=5

response.request.headers:
{'accept-language': 'zh-CN,zh;q=0.8', 'accept-encoding': 'gzip, deflate, sdch', 'X-Requested-With': 'XMLHttpRequest', 'accept': 'application/json, text/javascript, */*; q=0.01', 'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36', 'Connection': 'keep-alive', 'referer': 'https://so.dajie.com/job/search?keyword=%E9%A3%9E%E5%88%A9%E6%B5%A6&from=job&clicktype=blank', 'cookie': 'DJ_UVID=MTQ5MDMyMTExNTAzODM2MTc5; DJ_RF=empty; DJ_EU=http%3A%2F%2Fjob.dajie.com%2F; __login_tips=1; dj_cap=9c8c95bdef72e84a9bd7493a5ab91694; USER_ACTION="request^A-^A-^Ajobdetail:^A-"; SO_COOKIE_V2=0c7cGprjIH0q9RHc53CWLLXf151DQ5QvUP5ccPQj4g0B/izuXHm8sp41lJjJJh3nmjAkroj8JczFN/SCLPAUzbOHW7wYWmQ6Zu7s', 'method': 'get'}

response.headers:
{'Date': 'Wed, 19 Apr 2017 02:00:47 GMT', 'Content-Length': '5944', 'ETag': '"552f21de-1738"', 'Content-Type': 'text/html; charset=UTF-8', 'Connection': 'keep-alive'}

response.content[-1000:]:
，这个页面去火星了，试试搜索一下吧：</p>
    <form action="http://so.dajie.com/job/search" target="_top" class="search" method="get">
      <input type="text" placeholder="搜索感兴趣的职位" autocomplete="off" name="keyword"/><button type="submit">搜索</button>
      <input type="hidden" name="jobsearch" value="8"/>
    </form>
  </p>
   <p class="error-404">
     <p class="buttonwrap">
       <a  class="button guest" id="guest" title="" href="http://www.dajie.com/"><b>逛逛大街</b></a>
       <a  class="button report" id="report" title="" href="mailto:service@dajie.com"><b>报告管理员</b></a>
     </p>
   </p>
  </p>
  <script type="text/javascript">
    $(function(){
      $('input[placeholder]').each(function(){
        var $dom = $(this);
        var tip = $dom.attr('placeholder');
        $.placeholder($dom, {
          placeTextClass : 'placeholder',
          placeText : tip
        });
      });
    });
  </script>
 </body>
</html>

response:
<Response [299]>

疑问：
1，‘https://so.dajie.com/job/ajax...’，这个页面打开怎么不是json数据页面呢？我之前看的教程里边给的链接打开就是数据额，比如：‘https://rate.tmall.com/list_d...’。
2，第一次使用requests请求ajax数据，是不是请求时少写什么东西了？
2，我现在只是尝试修改了各种请求参数，但是还是得不到json数据，思考方向错了？

谢。