Scrapy runs but doesn't crawl site - Scrapy Shell response in loop - web-scraping

Question

I've tried to set up Scrapy to crawl a database for technical norm and standards.
What is the problem:
I wrote a Scraper, got a 200 response but no results - it scraped 0 pages:
2020-09-06 12:42:00 [scrapy.utils.log] INFO: Scrapy 1.5.1 started (bot: stack)
2020-09-06 12:42:00 [scrapy.utils.log] INFO: Versions: lxml 4.2.5.0, libxml2 2.9.5, cssselect 1.0.3, parsel 1.5.1, w3lib 1.19.0, Twisted 18.9.0, Python 3.7.2 (tags/v3.7.2:9a3ffc0492, Dec 23 2018, 22:20:52) [MSC v.1916 32 bit (Intel)], pyOpenSSL 18.0.0 (OpenSSL 1.1.0j 20 Nov 2018), cryptography 2.4.2, Platform Windows-10-10.0.18362-SP0
2020-09-06 12:42:00 [scrapy.crawler] INFO: Overridden settings: {'BOT_NAME': 'stack', 'NEWSPIDER_MODULE': 'stack.spiders', 'SPIDER_MODULES': ['stack.spiders'], 'USER_AGENT': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36'}
2020-09-06 12:42:00 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats',
'scrapy.extensions.telnet.TelnetConsole',
'scrapy.extensions.logstats.LogStats']
2020-09-06 12:42:01 [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.httpproxy.HttpProxyMiddleware',
'scrapy.downloadermiddlewares.stats.DownloaderStats']
2020-09-06 12:42:01 [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']
2020-09-06 12:42:01 [scrapy.middleware] INFO: Enabled item pipelines:
[]
2020-09-06 12:42:01 [scrapy.core.engine] INFO: Spider opened
2020-09-06 12:42:01 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2020-09-06 12:42:01 [scrapy.extensions.telnet] DEBUG: Telnet console listening on 127.0.0.1:6023
2020-09-06 12:42:01 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.beuth.de/de/regelwerke/vdi/vdi-richtlinien-entwuerfe> (referer: None)
2020-09-06 12:42:01 [scrapy.core.engine] INFO: Closing spider (finished)
2020-09-06 12:42:01 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 341,
'downloader/request_count': 1,
'downloader/request_method_count/GET': 1,
'downloader/response_bytes': 6149,
'downloader/response_count': 1,
'downloader/response_status_count/200': 1,
'downloader/request_method_count/GET': 1,
'downloader/response_bytes': 6149,
'downloader/response_count': 1,
'downloader/response_status_count/200': 1,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2020, 9, 6, 10, 42, 1, 684021),
'log_count/DEBUG': 2,
'log_count/INFO': 7,
'response_received_count': 1,
'scheduler/dequeued': 1,
'scheduler/dequeued/memory': 1,
'scheduler/enqueued': 1,
'scheduler/enqueued/memory': 1,
'start_time': datetime.datetime(2020, 9, 6, 10, 42, 1, 140686)}
2020-09-06 12:42:01 [scrapy.core.engine] INFO: Spider closed (finished)
Here are my items out of the items.py file which I want to scrape:
from scrapy.item import Item, Field
class StackItem(Item):
title = Field()
url = Field()
date = Field()
price = Field()
subtitle = Field()
description = Field()
This my crawler code:
from scrapy import Spider
from scrapy.selector import Selector
from stack.items import StackItem
class StackSpider(Spider):
name = "stack"
allowed_domains = ["www.beuth.de"]
start_urls = [
"https://www.beuth.de/de/regelwerke/vdi/vdi-richtlinien-entwuerfe",
]
def parse(self, response):
elements = Selector(response).xpath('//div[#class="bwr-card__inner"]')
for element in elements:
item = StackItem()
item['title'] = element.xpath('a[#class="bwr-link__label"]/text()').extract()[0]
item['url'] = element.xpath('a[#class="bwr-card__title-link"]/#href').extract()[0]
item['date'] = element.xpath('div[#class="bwr-type__item bwr-type__item--light"]/text()').extract()[0]
item['price'] = element.xpath('div[#class="bwr-buybox__price-emph]/text()').extract()[0]
item['subtitle'] = element.xpath('div[#class="bwr-card__subtitle bwr-data-dlink"]/text()').extract()[0]
item['description'] = element.xpath('div[#class="bwr-card__text bwr-rte bwr-data-dlink"]/text()').extract()[0]
yield item
What I tried so solve the problem:
I tried the Scrapy-Shell. After I used a defined User-Agent the website didn't block me:
In [2]: from scrapy import Request
...: req = Request("https://www.beuth.de/de/regelwerke/vdi/vdi-richtlinien-entwuerfe",
headers={"USER-AGENT" : "Mozi
...: lla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 OPR/45.0.
...: 2552.888"})
...: fetch(req)
2020-09-06 12:48:19 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.beuth.de/de/regelwerke/vdi/vdi-richtlinien-entwuerfe>
(referer: None)
After that I tested the selectors (see items list above) but unfortunately I just get a [] whatever XPath I use:
In [3]: response.xpath("//div[#class='bwr-buybox__price']/a/text").getall()
Out[3]: []
When I try view(response) I just a Browser Window with an infinite loading loop.
I tried to analyse the outcome but without an error I wasnt sure, where to start fixing.
I defined a User Agent in the settings.py because otherwise I got an error message about blocking (I think the website dont allow crawls).
Summary:
I want to scrape the Items above from the list. But I am not sure if there is just a problem with my selectors because testing in Shell results in a [ ] everytime.