First scrape is OK but proceeding scrapes fails with "AttributeError: 'NoneType' object has no attribute 'all_headers'" #102
Description
I'm trying to use playwright with scrapy but so far I've been stuck on the same problem for a couple of days.
As I try to scrape two links from an array the first one is successful and proceeds to the parse function but all next scrapes fails with this stack trace:
2022-06-29 19:26:44 [scrapy.core.scraper] ERROR: Error downloading <GET https://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&tab=all&SearchText=purple%20shoes>
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/twisted/internet/defer.py", line 1656, in _inlineCallbacks
result = current_context.run(
File "/usr/local/lib/python3.9/site-packages/twisted/python/failure.py", line 514, in throwExceptionIntoGenerator
return g.throw(self.type, self.value, self.tb)
File "/usr/local/lib/python3.9/site-packages/scrapy/core/downloader/middleware.py", line 49, in process_request
return (yield download_func(request=request, spider=spider))
File "/usr/local/lib/python3.9/site-packages/twisted/internet/defer.py", line 1030, in adapt
extracted = result.result()
File "/usr/local/lib/python3.9/site-packages/scrapy_playwright/handler.py", line 275, in _download_request
result = await self._download_request_with_page(request, page)
File "/usr/local/lib/python3.9/site-packages/scrapy_playwright/handler.py", line 308, in _download_request_with_page
headers = Headers(await response.all_headers())
AttributeError: 'NoneType' object has no attribute 'all_headers'
This is requirements.txt, running in python:3.9 docker:
Scrapy==2.6.1
scrapy-user-agents==0.1.1
scrapy-playwright==0.0.18
This is the crawler code:
import scrapy
from scrapy.http import Request
class AlibabaCrawlerSpider(scrapy.Spider):
name = 'alibaba_crawler'
allowed_domains = ['alibaba.com']
start_urls = ["https://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&tab=all&SearchText={0}".format("green shoes"),
"https://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&tab=all&SearchText={0}".format("purple shoes")]
custom_settings={
"TWISTED_REACTOR": "twisted.internet.asyncioreactor.AsyncioSelectorReactor",
"DOWNLOAD_HANDLERS": {
"https": "scrapy_playwright.handler.ScrapyPlaywrightDownloadHandler",
"http": "scrapy_playwright.handler.ScrapyPlaywrightDownloadHandler",
}
}
def start_requests(self):
for url in self.start_urls:
print("Search Url:", url)
yield scrapy.Request(url, callback=self.parse_search, meta={
"playwright": True,
"playwright_include_page": False,
"playwright_context": "new"})
def parse_search(self, response):
print("Parsing search:", response.url)
Scrapy settings.py
BOT_NAME = 'scrapy_alibaba'
SPIDER_MODULES = ['scrapy_alibaba.spiders']
NEWSPIDER_MODULE = 'scrapy_alibaba.spiders'
LOG_LEVEL = 'INFO'
ROBOTSTXT_OBEY = False
CONCURRENT_REQUESTS = 1
DOWNLOAD_DELAY = 1
CONCURRENT_REQUESTS_PER_DOMAIN = 1
PLAYWRIGHT_PROCESS_REQUEST_HEADERS=None
PLAYWRIGHT_MAX_PAGES_PER_CONTEXT=1
DEFAULT_REQUEST_HEADERS = {
'authority': 'www.alibaba.com',
'pragma': 'no-cache',
'cache-control': 'no-cache',
'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
'dnt': '1',
'upgrade-insecure-requests': '1',
'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36',
'sec-fetch-site': 'same-origin',
'sec-fetch-mode': 'cors',
'sec-fetch-dest': 'empty',
'referer': 'https://www.alibaba.com/sw.js?v=2.13.12&_flasher_manifest_=https://s.alicdn.com/@g/flasher-manifest/icbu-v2/manifestB.json',
'accept-language': 'en-GB,en-US;q=0.9,en;q=0.8',
}
DOWNLOAD_TIMEOUT = 15
DNS_TIMEOUT = 15
Full scrapy log:
2022-06-29 19:26:22 [scrapy.utils.log] INFO: Scrapy 2.6.1 started (bot: scrapy_alibaba)
2022-06-29 19:26:22 [scrapy.utils.log] INFO: Versions: lxml 4.9.0.0, libxml2 2.9.14, cssselect 1.1.0, parsel 1.6.0, w3lib 1.22.0, Twisted 22.4.0, Python 3.9.13 (main, Jun 23 2022, 11:12:54) - [GCC 10.2.1 20210110], pyOpenSSL 22.0.0 (OpenSSL 3.0.3 3 May 2022), cryptography 37.0.2, Platform Linux-5.4.72-microsoft-standard-WSL2-x86_64-with-glibc2.31
2022-06-29 19:26:22 [scrapy.crawler] INFO: Overridden settings:
{'BOT_NAME': 'scrapy_alibaba',
'CONCURRENT_REQUESTS': 1,
'CONCURRENT_REQUESTS_PER_DOMAIN': 1,
'DNS_TIMEOUT': 15,
'DOWNLOAD_DELAY': 1,
'DOWNLOAD_TIMEOUT': 15,
'LOG_LEVEL': 'INFO',
'NEWSPIDER_MODULE': 'scrapy_alibaba.spiders',
'SPIDER_MODULES': ['scrapy_alibaba.spiders'],
'TWISTED_REACTOR': 'twisted.internet.asyncioreactor.AsyncioSelectorReactor'}
2022-06-29 19:26:22 [scrapy.extensions.telnet] INFO: Telnet Password: qwe13124ae213r
2022-06-29 19:26:22 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats',
'scrapy.extensions.telnet.TelnetConsole',
'scrapy.extensions.memusage.MemoryUsage',
'scrapy.extensions.logstats.LogStats']
2022-06-29 19:26:22 [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']
2022-06-29 19:26:22 [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']
2022-06-29 19:26:22 [botocore.credentials] INFO: Found credentials in shared credentials file: ~/.aws/credentials
2022-06-29 19:26:23 [botocore.credentials] INFO: Found credentials in shared credentials file: ~/.aws/credentials
2022-06-29 19:26:23 [botocore.credentials] INFO: Found credentials in shared credentials file: ~/.aws/credentials
2022-06-29 19:26:23 [scrapy.middleware] INFO: Enabled item pipelines:
['scrapy_alibaba.pipelines.ItemParameterSplitterPipeline',
'scrapy_alibaba.pipelines.ValidateItemPipeline',
'scrapy_alibaba.pipelines.UpsertItemToDynamoPipeline']
2022-06-29 19:26:23 [scrapy.core.engine] INFO: Spider opened
2022-06-29 19:26:23 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2022-06-29 19:26:23 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6023
2022-06-29 19:26:23 [scrapy-playwright] INFO: Starting download handler
2022-06-29 19:26:23 [scrapy-playwright] INFO: Starting download handler
Search Url: https://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&tab=all&SearchText=green shoes
2022-06-29 19:26:28 [scrapy-playwright] INFO: Launching browser chromium
2022-06-29 19:26:28 [scrapy-playwright] INFO: Browser chromium launched
Search Url: https://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&tab=all&SearchText=purple shoes
Parsing search: https://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&tab=all&SearchText=green%20shoes
2022-06-29 19:26:44 [scrapy.core.scraper] ERROR: Error downloading <GET https://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=&tab=all&SearchText=purple%20shoes>
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/twisted/internet/defer.py", line 1656, in _inlineCallbacks
result = current_context.run(
File "/usr/local/lib/python3.9/site-packages/twisted/python/failure.py", line 514, in throwExceptionIntoGenerator
return g.throw(self.type, self.value, self.tb)
File "/usr/local/lib/python3.9/site-packages/scrapy/core/downloader/middleware.py", line 49, in process_request
return (yield download_func(request=request, spider=spider))
File "/usr/local/lib/python3.9/site-packages/twisted/internet/defer.py", line 1030, in adapt
extracted = result.result()
File "/usr/local/lib/python3.9/site-packages/scrapy_playwright/handler.py", line 275, in _download_request
result = await self._download_request_with_page(request, page)
File "/usr/local/lib/python3.9/site-packages/scrapy_playwright/handler.py", line 308, in _download_request_with_page
headers = Headers(await response.all_headers())
AttributeError: 'NoneType' object has no attribute 'all_headers'
2022-06-29 19:26:44 [scrapy.core.engine] INFO: Closing spider (finished)
2022-06-29 19:26:44 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/exception_count': 1,
'downloader/exception_type_count/builtins.AttributeError': 1,
'downloader/request_bytes': 1607,
'downloader/request_count': 2,
'downloader/request_method_count/GET': 2,
'downloader/response_bytes': 1024460,
'downloader/response_count': 1,
'downloader/response_status_count/200': 1,
'elapsed_time_seconds': 21.077569,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2022, 6, 29, 19, 26, 44, 206784),
'log_count/ERROR': 1,
'log_count/INFO': 17,
'memusage/max': 76918784,
'memusage/startup': 76918784,
'playwright/context_count': 1,
'playwright/context_count/max_concurrent': 1,
'playwright/context_count/non-persistent': 1,
'playwright/page_count': 2,
'playwright/page_count/closed': 2,
'playwright/page_count/max_concurrent': 1,
'playwright/request_count': 517,
'playwright/request_count/method/GET': 470,
'playwright/request_count/method/HEAD': 16,
'playwright/request_count/method/POST': 31,
'playwright/request_count/navigation': 16,
'playwright/request_count/resource_type/document': 16,
'playwright/request_count/resource_type/fetch': 29,
'playwright/request_count/resource_type/font': 14,
'playwright/request_count/resource_type/image': 205,
'playwright/request_count/resource_type/ping': 25,
'playwright/request_count/resource_type/script': 170,
'playwright/request_count/resource_type/stylesheet': 38,
'playwright/request_count/resource_type/xhr': 20,
'playwright/response_count': 483,
'playwright/response_count/method/GET': 448,
'playwright/response_count/method/HEAD': 8,
'playwright/response_count/method/POST': 27,
'playwright/response_count/resource_type/document': 14,
'playwright/response_count/resource_type/fetch': 21,
'playwright/response_count/resource_type/font': 14,
'playwright/response_count/resource_type/image': 201,
'playwright/response_count/resource_type/ping': 22,
'playwright/response_count/resource_type/script': 156,
'playwright/response_count/resource_type/stylesheet': 38,
'playwright/response_count/resource_type/xhr': 17,
'response_received_count': 1,
'scheduler/dequeued': 2,
'scheduler/dequeued/memory': 2,
'scheduler/enqueued': 2,
'scheduler/enqueued/memory': 2,
'start_time': datetime.datetime(2022, 6, 29, 19, 26, 23, 129215)}
2022-06-29 19:26:44 [scrapy.core.engine] INFO: Spider closed (finished)
2022-06-29 19:26:44 [scrapy-playwright] INFO: Closing download handler
2022-06-29 19:26:44 [scrapy-playwright] INFO: Closing download handler
2022-06-29 19:26:44 [scrapy-playwright] INFO: Closing browser
I noticed if I remove PLAYWRIGHT_PROCESS_REQUEST_HEADERS=None from settings.py I'll get this stacktrace instead:
2022-06-29 19:35:31 [asyncio] ERROR: Task exception was never retrieved
future: <Task finished name='Task-737' coro=<Channel.send() done, defined at /usr/local/lib/python3.9/site-packages/playwright/_impl/_connection.py:38> exception=Error('headers[5].value: expected string, got object')>
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/playwright/_impl/_connection.py", line 39, in send
return await self.inner_send(method, params, False)
File "/usr/local/lib/python3.9/site-packages/playwright/_impl/_connection.py", line 63, in inner_send
result = next(iter(done)).result()
playwright._impl._api_types.Error: headers[5].value: expected string, got object
But I'm unsure of why I would get either of these stack traces. And now I'm nice too and run the requests in sequel. Any idea how to solve these errors?