Shulou(Shulou.com)06/03 Report--

Common errors in crawler requests

200: how to handle the request successfully: get the content of the response and process it

201: the request is completed, and the result is that a new resource is created. The URI of the newly created resource can be handled in the responding entity: it is not encountered in the crawler

202: the request is accepted, but the processing has not been completed. Processing method: blocking wait

204: the server has implemented the request, but no new message has been returned. If the customer is a user agent, there is no need to update their own document view for this. Handling method: discarding

This status code is not directly used by HTTP/1.0 applications, but is only used as the default interpretation of the 3XX type response. There are multiple requested resources available. Handling method: if it can be processed in the program, it will be further processed, and if it cannot be processed in the program, it will be discarded.

301: all requested resources are assigned a permanent URL so that the resource handling method can be accessed in the future through this URL: redirect to the assigned URL

302: the requested resource is temporarily saved at a different URL: redirected to temporary URL

304 requested resources are not updated: discarded

400 illegal request processing: discarding

401 unauthorized processing: discard

403 forbidden processing: discard

404 did not find a way to handle it: discard

The 5XX response code with a status code starting with "5" indicates that the server has found an error and cannot continue to perform request processing: discard

Without saying too much, just play the code from scrapy import log import random from scrapy.downloadermiddlewares.useragent import UserAgentMiddleware class RotateUserAgentMiddleware (UserAgentMiddleware): # for more useragent strings,you can find it in http://www.useragentstring.com/pages/useragentstring.php user_agent_list = ["Mozilla/5.0 (Windows NT 6. 1) WOW64) AppleWebKit/537.1 "(KHTML, like Gecko) Chrome/22.0.1207.1 Safari/537.1", "Mozilla/5.0 (X11; CrOS i686 2268.111.0) AppleWebKit/536.11" (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11 "," Mozilla/5.0 (Windows NT 6.1) WOW64) AppleWebKit/536.6 "(KHTML, like Gecko) Chrome/20.0.1092.0 Safari/536.6", "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.6" (KHTML, like Gecko) Chrome/20.0.1090.0 Safari/536.6 "," Mozilla/5.0 (Windows NT 6.2) WOW64) AppleWebKit/537.1 "(KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.1", "Mozilla/5.0 (X11)" Linux x86 / 64) AppleWebKit/536.5 "(KHTML, like Gecko) Chrome/19.0.1084.9 Safari/536.5", "Mozilla/5.0 (Windows NT 6 / 0) AppleWebKit/536.5"(KHTML, like Gecko) Chrome/19.0.1084.36 Safari/536.5", "Mozilla/5.0 (Windows NT 6.1) WOW64) AppleWebKit/536.3 "(KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3", "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.3" (KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3 "," Mozilla/5.0 (Macintosh) Intel Mac OS X 10: 8) AppleWebKit/536.3 "(KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3", "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3" (KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3 "," Mozilla/5.0 (Windows NT 6.1) WOW64) AppleWebKit/536.3 "(KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3", "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3" (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3 "," Mozilla/5.0 (Windows NT 6.1) WOW64) AppleWebKit/536.3 "(KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.3" (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3 "," Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 "(KHTML) Like Gecko) Chrome/19.0.1061.0 Safari/536.3 "," Mozilla/5.0 (X11) Linux x86 / 64) AppleWebKit/535.24 "(KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24", "Mozilla/5.0 (Windows NT 6.2) WOW64) AppleWebKit/535.24 "(KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24"] def process_request (self, request Spider): ua = random.choice (self.user_agent_list) if ua: # displays the currently used useragent print "* Current UserAgent:%s*"% ua # record log.msg ('Current UserAgent:' + ua) request.headers.setdefault ('User-Agent', ua)

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