允许在Scrapy

重定向这是我的中间件：允许在Scrapy

from scrapy.contrib.downloadermiddleware.useragent import UserAgentMiddleware 
from scrapy.exceptions import IgnoreRequest 
from scrapy import log 

class FilterURLs(object): 
    def process_response(self,request, response, spider): 
     if response.status == 301 : 
      return response 
     else: 
      headers = ['text/html; charset=UTF-8', 'text/html; charset=utf-8', 'text/html;charset=UTF-8', 'text/html;charset=utf-8','text/html;charset=ISO-8859-1','application/xhtml+xml; charset=utf-8'] 
      log.msg("In Middleware " + repr(response.headers['Content-Type']), level=log.INFO) 
      for header in headers: 
       if response.headers['Content-Type'] != header: 
        raise IgnoreRequest() 
       else: 
        return response

我的错误：

2014-01-09 13:08:56+0530 [crawler] DEBUG: Redirecting (301) to <GET http://www.altria.com/Pages/default.aspx> from <GET http://www.altria.com> 
2014-01-09 13:08:58+0530 [scrapy] INFO: In Middleware 'text/html; charset=utf-8' 
2014-01-09 13:08:58+0530 [crawler] ERROR: Error downloading <GET http://www.altria.com/Pages/default.aspx> 
Traceback (most recent call last):

我刮刀与错误停止。它不能刮取重定向的链接吗？是否因为无法获取重定向链接的内容类型？

来源

2014-01-09 blackmamba

什么是回溯更换您的for循环

for header in headers: if response.headers['Content-Type'] != header: raise IgnoreRequest() else: return response

？ –

http://pastebin.com/aCkFX7BS – blackmamba

更新：

第二次看后，我可以使用Scrapy 0.20不能重现你的错误。

中间件：

from scrapy.contrib.downloadermiddleware.useragent import UserAgentMiddleware 
from scrapy.exceptions import IgnoreRequest 
from scrapy import log 


class FilterURLs(object): 
    def process_response(self,request, response, spider): 
     if response.status == 301 : 
      return response 
     else: 
      headers = ['text/html; charset=UTF-8', 'text/html; charset=utf-8', 'text/html;charset=UTF-8', 'text/html;charset=utf-8','text/html;charset=ISO-8859-1','application/xhtml+xml; charset=utf-8'] 
      log.msg("In Middleware " + repr(response.headers['Content-Type']), level=log.INFO) 
      for header in headers: 
       if response.headers['Content-Type'] != header: 
        log.msg("Ignoring response %r" % request) 
        raise IgnoreRequest() 
       else: 
        return response

蜘蛛：

from scrapy.spider import BaseSpider 


class MySpider(BaseSpider): 
    name = 'filtertest' 
    start_urls = ['http://www.altria.com'] 

    def parse(self, response): 
     self.log(response.url)

的设置：

DOWNLOADER_MIDDLEWARES = { 
    'mytest.dlmw.FilterURLs': 1, 
}

的scrapy crawl filtertest输出：

2014-01-10 10:05:27-0400 [scrapy] INFO: Scrapy 0.20.0 started (bot: pipetest) 
2014-01-10 10:05:27-0400 [scrapy] DEBUG: Optional features available: ssl, http11, boto, django 
2014-01-10 10:05:27-0400 [scrapy] DEBUG: Overridden settings: {'NEWSPIDER_MODULE': 'pipetest.spiders', 'SPIDER_MODULES': ['pipetest.spiders'], 'BOT_NAME': 'pipetest'} 
2014-01-10 10:05:27-0400 [scrapy] DEBUG: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState 
2014-01-10 10:05:27-0400 [scrapy] DEBUG: Enabled downloader middlewares: FilterURLs, HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, HttpProxyMiddleware, ChunkedTransferMiddleware, DownloaderStats 
2014-01-10 10:05:27-0400 [scrapy] DEBUG: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware 
2014-01-10 10:05:27-0400 [scrapy] DEBUG: Enabled item pipelines: MyPipeline 
2014-01-10 10:05:27-0400 [filtertest] INFO: Spider opened 
2014-01-10 10:05:27-0400 [filtertest] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min) 
2014-01-10 10:05:27-0400 [filtertest] DEBUG: [MyPipeline] Initializing resources for filtertest 
2014-01-10 10:05:27-0400 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6023 
2014-01-10 10:05:27-0400 [scrapy] DEBUG: Web service listening on 0.0.0.0:6080 
2014-01-10 10:05:28-0400 [filtertest] DEBUG: Redirecting (301) to <GET http://www.altria.com/Pages/default.aspx> from <GET http://www.altria.com> 
2014-01-10 10:05:28-0400 [scrapy] INFO: In Middleware 'text/html; charset=utf-8' 
2014-01-10 10:05:28-0400 [scrapy] INFO: Ignoring response <GET http://www.altria.com/Pages/default.aspx> 
2014-01-10 10:05:28-0400 [filtertest] INFO: Closing spider (finished) 
2014-01-10 10:05:28-0400 [filtertest] INFO: Dumping Scrapy stats: 
    {'downloader/request_bytes': 458, 
    'downloader/request_count': 2, 
    'downloader/request_method_count/GET': 2, 
    'downloader/response_bytes': 21358, 
    'downloader/response_count': 2, 
    'downloader/response_status_count/200': 1, 
    'downloader/response_status_count/301': 1, 
    'finish_reason': 'finished', 
    'finish_time': datetime.datetime(2014, 1, 10, 14, 5, 28, 452610), 
    'log_count/DEBUG': 8, 
    'log_count/INFO': 5, 
    'scheduler/dequeued': 2, 
    'scheduler/dequeued/memory': 2, 
    'scheduler/enqueued': 2, 
    'scheduler/enqueued/memory': 2, 
    'start_time': datetime.datetime(2014, 1, 10, 14, 5, 27, 748879)} 
2014-01-10 10:05:28-0400 [filtertest] INFO: Spider closed (finished)

以前的答案：试试这个

 allowed_headers = ['text/html; charset=UTF-8', 'text/html; charset=utf-8', 'text/html;charset=UTF-8', 'text/html;charset=utf-8','text/html;charset=ISO-8859-1','application/xhtml+xml; charset=utf-8'] 
     log.msg("In Middleware " + repr(response.headers['Content-Type']), level=log.INFO) 
     if response.headers['Content-Type'] in allowed_headers: 
      return response

来源

2014-01-10 13:38:30 Rolando

那么重定向呢？因为当它遇到重定向时，它无法检查重定向的url头部。 – blackmamba

@wannaC我无法重现您的错误。查看更新后的答案。你的设置是否正确？ – Rolando

我试过你以前的答案。它的作品。 – blackmamba

我在scrapy没有经验，但您的堆栈跟踪显示你提到IgnoreRequest（）为你做了明确。如果你只是想提高对不兼容的报头之外然后用

if not response.headers['Content-Type'] in headers: 
    raise IgnoreRequest() 
else: 
    return response

来源

2014-01-10 13:44:33 Samuel

回答

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