title: HTTP status code is not handled or not allowed
body: <p>I need crawl a site with cookie using Scrapy,but returns error</p>
  
  <p>code here</p>
  
  <pre><code>class XueqiuSpider(scrapy.Spider):
      name = "xueqiu"
      start_urls = ["https://xueqiu.com/stock/f10/finmainindex.json?symbol=SZ000001&amp;page=1&amp;size=1"]
      delimiter = ','
      quotechar = '"'
      headers = ["symbol","date","open","high","low","close","volume"]
  
      def start_requests(self):
          for i,url in enumerate(self.start_urls):
              print(url)
              yield Request(url,cookies={'aliyungf_tc':'AQAAANiAQ3xQ/QAAZ0J2fRFnxcJufEzG'},callback=self.parse_item)
  
      def parse_item(self, response):
          print response
  </code></pre>
  
  <p>errors show</p>
  
  <pre><code>********Current UserAgent:Mozilla/5.0 (X11; CrOS i686 2268.111.0) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11************
  2017-03-02 18:56:02 [scrapy.downloadermiddlewares.cookies] DEBUG: Sending cookies to: &lt;GET https://xueqiu.com/stock/f10/finmainindex.json?symbol=SZ000001&amp;page=1&amp;size=1&gt;
  Cookie: aliyungf_tc=AQAAANiAQ3xQ/QAAZ0J2fRFnxcJufEzG; aliyungf_tc=AQAAAM/c+1g5vAMAZ0J2fbusPyBy7jb1
  
  2017-03-02 18:56:02 [scrapy.core.engine] DEBUG: Crawled (400) &lt;GET https://xueqiu.com/stock/f10/finmainindex.json?symbol=SZ000001&amp;page=1&amp;size=1&gt; (referer: None)
  2017-03-02 18:56:02 [scrapy.spidermiddlewares.httperror] INFO: Ignoring response &lt;400 https://xueqiu.com/stock/f10/finmainindex.json?symbol=SZ000001&amp;page=1&amp;size=1&gt;: HTTP status code is not handled or not allowed
  </code></pre>