Simulate Ajax Call with Scrapy - ajax

Question

i'm new at scraping with Scrapy and unfortunatly, i can't access data through a request (to simulate an AJAX request made).
I read others topics, but it didnt help me resolve my issues.
The website i would like to crawl is auchan.fr ,it has a dynamic search box driven by algolia (algolia).
Here is my spider for a Nutella request(POST then):
class AjaxspiderSpider(scrapy.Spider):
name = "ajaxspider"
allowed_domains = ["auchandirect.fr/recherche"]
#start_urls = ['https://www.auchandirect.fr/recherche/']
def start_requests(self):
full_url = "/1/indexes/articles_article_11228/query?x-algolia-agent=Algolia%20for%20vanilla%20JavaScript%203.20.4&x-algolia-application-id=TN96V7LRXC&x-algolia-api-key=46a121512cba9c452df318ffca231225"
yield FormRequest('https://tn96v7lrxc-dsn.algolia.net' + full_url, callback=self.parse, formdata={"params":"query=nutella&facets=%5B%22loopr_shelf%22%5D&hitsPerPage=50"})
def parse(self, response):
with open('data_content', 'w') as file:
file.write(response.content)
and Here is the log i got :
2017-02-03 15:14:34 [scrapy.utils.log] INFO: Scrapy 1.3.0 started (bot: ajax)
2017-02-03 15:14:34 [scrapy.utils.log] INFO: Overridden settings: {'SPIDER_MODULES': ['ajax.spiders'], 'NEWSPIDER_MODULE': 'ajax.spiders', 'BOT_NAME': 'ajax'}
2017-02-03 15:14:34 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.telnet.TelnetConsole',
'scrapy.extensions.logstats.LogStats',
'scrapy.extensions.corestats.CoreStats']
2017-02-03 15:14:34 [scrapy.middleware] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',
'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',
'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',
'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',
'scrapy.downloadermiddlewares.retry.RetryMiddleware',
'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',
'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',
'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',
'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',
'scrapy.downloadermiddlewares.stats.DownloaderStats']
2017-02-03 15:14:34 [scrapy.middleware] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
'scrapy.spidermiddlewares.referer.RefererMiddleware',
'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
'scrapy.spidermiddlewares.depth.DepthMiddleware']
2017-02-03 15:14:34 [scrapy.middleware] INFO: Enabled item pipelines:
[]
2017-02-03 15:14:34 [scrapy.core.engine] INFO: Spider opened
2017-02-03 15:14:34 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2017-02-03 15:14:34 [scrapy.extensions.telnet] DEBUG: Telnet console listening on 127.0.0.1:6023
2017-02-03 15:14:35 [scrapy.core.engine] DEBUG: Crawled (400) <POST https://tn96v7lrxc-dsn.algolia.net/1/indexes/articles_article_11228/query?x-algolia-agent=Algolia%20for%20vanilla%20JavaScript%203.20.4&x-algolia-application-id=TN96V7LRXC&x-algolia-api-key=46a121512cba9c452df318ffca231225> (referer: None)
2017-02-03 15:14:35 [scrapy.spidermiddlewares.httperror] INFO: Ignoring response <400 https://tn96v7lrxc-dsn.algolia.net/1/indexes/articles_article_11228/query?x-algolia-agent=Algolia%20for%20vanilla%20JavaScript%203.20.4&x-algolia-application-id=TN96V7LRXC&x-algolia-api-key=46a121512cba9c452df318ffca231225>: HTTP status code is not handled or not allowed
2017-02-03 15:14:35 [scrapy.core.engine] INFO: Closing spider (finished)
2017-02-03 15:14:35 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 545,
'downloader/request_count': 1,
'downloader/request_method_count/POST': 1,
'downloader/response_bytes': 338,
'downloader/response_count': 1,
'downloader/response_status_count/400': 1,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2017, 2, 3, 14, 14, 35, 216807),
'log_count/DEBUG': 2,
'log_count/INFO': 8,
'response_received_count': 1,
'scheduler/dequeued': 1,
'scheduler/dequeued/memory': 1,
'scheduler/enqueued': 1,
'scheduler/enqueued/memory': 1,
'start_time': datetime.datetime(2017, 2, 3, 14, 14, 34, 977436)}
2017-02-03 15:14:35 [scrapy.core.engine] INFO: Spider closed (finished)
i thank you for any piece for informations

Answer 1

This is not Ajax-related but site-specific question, you just passes search parameters string wrong way trying to pass it as formdata while it should be passed as raw body of POST request, so it should be like that:
yield Request('https://tn96v7lrxc-dsn.algolia.net' + full_url,
callback=self.parse, method='POST',
body='{"params":"query=nutella&facets=%5B%22loopr_shelf%22%5D&hitsPerPage=50"}')