title: 403 error when scrapying this website
body: <p>I am trying to crawl a website</p>
  
  <p>this website returns <code>Error, query failed</code> in the body. then I click on <code>Find USED</code> tab. then I click search to get the result. the search button is actually making a post reqeust and get the data.</p>
  
  <p>This is my spider:</p>
  
  <pre><code>    def start_requests(self):
          for url in self.start_urls:
              yield self.make_requests_from_url(url)
  
      def make_requests_from_url(self, url):
          return Request(url,cookies={'PHPSESSID':'0a94ce3bf2484d5102a047b86f5b6c17','__utm':'154876456.1461047540.1397668365.1397668365.1397668365.1',', callback=self.page_parse)
  
      def parse(self,response):
          sel = Selector(response)
          print sel
  </code></pre>
  
  <p>I got this response:</p>
  
  <pre><code>2014-04-16 21:04:27+0300 [XXX] DEBUG: Crawled (403) &lt;POST http://website&gt; (referer: None)
  </code></pre>
  
  <p>what am I doing wrong please?</p>
  
  <p>I analysed the request when I clicked the search button and this is the request</p>
  
  <pre><code>http://www.autodealer.ae/plugins/ad/buy.php?q=used+cars+dubai
  
  
  
  User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  Accept-Language: en-US,en;q=0.5
  Accept-Encoding: gzip, deflate
  Cookie: PHPSESSID=0a94ce3bf2484d5102a047b86f5b6c17;
  Connection: keep-alive
  Content-Type: application/x-www-form-urlencoded
  Content-Length: 131
  </code></pre>
  
  <p>what am i doing wrong?</p>
  
  <p>or how to crawl that website please?</p>
  
  <p>am I doing wrong on my spider?</p>