title: Can't get through a form with scrapy
body: <p>I'm new with using scrapy and i'm trying to get some info from a real estate website. 
  The site has a home page with a search form (method GET).
  I'm trying to go to the results page in my start_requests (recherche.php), and setting all the get parameters i see in the address bar in the formdata parameter. 
  I also set up the cookies i had, but he didn't work either..</p>
  
  <p>Here's my spider:</p>
  
  <pre><code>from scrapy.spider import BaseSpider
  from scrapy.selector import HtmlXPathSelector
  from scrapy.http import FormRequest, Request
  
  from robots_immo.items import AnnonceItem
  
  class ElyseAvenueSpider(BaseSpider):
      name = "elyse_avenue"
      allowed_domains = ["http://www.elyseavenue.com/"]
  
      def start_requests(self):
          return [FormRequest(url="http://www.elyseavenue.com/recherche.php",
                              formdata={'recherche':'recherche',
                                        'compteurLigne':'2',
                                        'numLigneCourante':'0',
                                        'inseeVille_0':'',
                                        'num_rubrique':'',
                                        'rechercheOK':'recherche',
                                        'recherche_budget_max':'',
                                        'recherche_budget_min':'',
                                        'recherche_surface_max':'',
                                        'recherche_surface_min':'',
                                        'recherche_distance_km_0':'20',
                                        'recherche_reference_bien':'',
                                        'recherche_type_logement':'9',
                                        'recherche_ville_0':''
                                       },
                              cookies={'PHPSESSID':'4e1d729f68d3163bb110ad3e4cb8ffc3',
                                       '__utma':'150766562.159027263.1340725224.1340725224.1340727680.2',
                                       '__utmc':'150766562',
                                       '__utmz':'150766562.1340725224.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)',
                                       '__utmb':'150766562.14.10.1340727680'
                                      },
                              callback=self.parseAnnonces
                             )]
  
  
  
      def parseAnnonces(self, response):
          hxs = HtmlXPathSelector(response)
          annonces = hxs.select('//div[@id="contenuCentre"]/div[@class="blocVignetteBien"]')
          items = []
          for annonce in annonces:
              item = AnnonceItem()
              item['nom'] = annonce.select('span[contains(@class,"nomBienImmo")]/a/text()').extract()
              item['superficie'] = annonce.select('table//tr[2]/td[2]/span/text()').extract()
              item['prix'] = annonce.select('span[@class="prixVignette"]/span[1]/text()').extract()
              items.append(item)
          return items
  
  
  SPIDER = ElyseAvenueSpider()
  </code></pre>
  
  <p>When i run the spider, there is no problem, but the page loaded is not the good one (it's saying "Please specify your search" and i don't get any results..)</p>
  
  <pre><code>2012-06-26 20:04:54+0200 [elyse_avenue] INFO: Spider opened
  2012-06-26 20:04:54+0200 [elyse_avenue] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
  2012-06-26 20:04:54+0200 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6023
  2012-06-26 20:04:54+0200 [scrapy] DEBUG: Web service listening on 0.0.0.0:6080
  2012-06-26 20:04:54+0200 [elyse_avenue] DEBUG: Crawled (200) &lt;POST http://www.elyseavenue.com/recherche.php&gt; (referer: None)
  2012-06-26 20:04:54+0200 [elyse_avenue] INFO: Closing spider (finished)
  2012-06-26 20:04:54+0200 [elyse_avenue] INFO: Dumping spider stats:
      {'downloader/request_bytes': 808,
       'downloader/request_count': 1,
       'downloader/request_method_count/POST': 1,
       'downloader/response_bytes': 7590,
       'downloader/response_count': 1,
       'downloader/response_status_count/200': 1,
       'finish_reason': 'finished',
       'finish_time': datetime.datetime(2012, 6, 26, 18, 4, 54, 924624),
       'scheduler/memory_enqueued': 1,
       'start_time': datetime.datetime(2012, 6, 26, 18, 4, 54, 559230)}
  2012-06-26 20:04:54+0200 [elyse_avenue] INFO: Spider closed (finished)
  2012-06-26 20:04:54+0200 [scrapy] INFO: Dumping global stats:
      {'memusage/max': 27410432, 'memusage/startup': 27410432}
  </code></pre>
  
  <p>Thanks for your help !</p>