scrapy 偽裝代理和fake_userAgent的使用

偽裝瀏覽器代理 在爬取網頁是有些服務器對請求過濾的不是很高可以不用ip來偽裝請求直接將自己的瀏覽器信息給偽裝也是可以的。

第一中方法：

1.在setting.py文件中加入以下內容，這是一些瀏覽器的頭信息

USER_AGENT_LIST = ['zspider/0.9-dev http://feedback.redkolibri.com/',
                    'Xaldon_WebSpider/2.0.b1',
                    'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) Speedy Spider (http://www.entireweb.com/about/search_tech/speedy_spider/)',
                    'Mozilla/5.0 (compatible; Speedy Spider; http://www.entireweb.com/about/search_tech/speedy_spider/)',
                    'Speedy Spider (Entireweb; Beta/1.3; http://www.entireweb.com/about/search_tech/speedyspider/)',
                    'Speedy Spider (Entireweb; Beta/1.2; http://www.entireweb.com/about/search_tech/speedyspider/)',
                    'Speedy Spider (Entireweb; Beta/1.1; http://www.entireweb.com/about/search_tech/speedyspider/)',
                    'Speedy Spider (Entireweb; Beta/1.0; http://www.entireweb.com/about/search_tech/speedyspider/)',
                    'Speedy Spider (Beta/1.0; www.entireweb.com)',
                    'Speedy Spider (http://www.entireweb.com/about/search_tech/speedy_spider/)',
                    'Speedy Spider (http://www.entireweb.com/about/search_tech/speedyspider/)',
                    'Speedy Spider (http://www.entireweb.com)',
                    'Sosospider+(+http://help.soso.com/webspider.htm)',
                    'sogou spider',
                    'Nusearch Spider (www.nusearch.com)',
                    'nuSearch Spider (compatible; MSIE 4.01; Windows NT)',
                    'lmspider ([e-mail])',
                    'lmspider [e-mail]',
                    'ldspider (http://code.google.com/p/ldspider/wiki/Robots)',
                    'iaskspider/2.0(+http://iask.com/help/help_index.html)',
                    'iaskspider',
                    'hl_ftien_spider_v1.1',
                    'hl_ftien_spider',
                    'FyberSpider (+http://www.fybersearch.com/fyberspider.php)',
                    'FyberSpider',
                    'everyfeed-spider/2.0 (http://www.everyfeed.com)',
                    'envolk[ITS]spider/1.6 (+http://www.envolk.com/envolkspider.html)',
                    'envolk[ITS]spider/1.6 ( http://www.envolk.com/envolkspider.html)',
                    'Baiduspider+(+http://www.baidu.com/search/spider_jp.html)',
                    'Baiduspider+(+http://www.baidu.com/search/spider.htm)',
                    'BaiDuSpider',
                    'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0) AddSugarSpiderBot www.idealobserver.com',
                   ]
2.在spider同級目錄下建立一個MidWare文件價里面寫一個HeaderMidWare.py文件 內容為

# encoding: utf-8
from scrapy.utils.project import get_project_settings
import random

settings = get_project_settings()

class ProcessHeaderMidware():
    """process request add request info"""

    def process_request(self, request, spider):
        """
        隨機從列表中獲得header， 並傳給user_agent進行使用
        """
        ua = random.choice(settings.get('USER_AGENT_LIST'))  
        spider.logger.info(msg='now entring download midware')
        if ua:
            request.headers['User-Agent'] = ua
            # Add desired logging message here.
            spider.logger.info(u'User-Agent is : {} {}'.format(request.headers.get('User-Agent'), request))
        pass

 3.在setting.py文件中添加

DOWNLOADER_MIDDLEWARES = {
    'projectName.MidWare.HeaderMidWare.ProcessHeaderMidware': 543,
}



第二種方法：fake_userAgent的使用

fake_userAgent是github上的開源項目
1.安裝fake_userAgent

pip install fake-useragent

2.在spider同級目錄下建立一個MidWare文件價里面寫一個user_agent_middlewares.py文件內容為

# -*- coding: utf-8 -*-
from fake_useragent import UserAgent

class RandomUserAgentMiddlware(object):
    #隨機跟換user-agent
    def __init__(self,crawler):
        super(RandomUserAgentMiddlware,self).__init__()
        self.ua = UserAgent()
        self.ua_type = crawler.settings.get('RANDOM_UA_TYPE','random')#從setting文件中讀取RANDOM_UA_TYPE值

    @classmethod
    def from_crawler(cls,crawler):
        return cls(crawler)

    def process_request(self,request,spider):  ###系統電泳函數
        def get_ua():
            return getattr(self.ua,self.ua_type)
        # user_agent_random=get_ua()
        request.headers.setdefault('User_Agent',get_ua())
        pass

3.在setting.py中添加

　　RANDOM_UA_TYPE = 'random'##random    chrome

　　DOWNLOADER_MIDDLEWARES = {

　　'projectName.MidWare.user_agent_middlewares.RandomUserAgentMiddlware': 543, 

  　 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware':None,

}

 

fake_userAgent偽裝代理就配置好了，與第一種方法相比不用寫一大串的瀏覽器頭，那些瀏覽器頭會在

https://fake-useragent.herokuapp.com/browsers/0.1.7 中得到。

 

在第一次啟用fake_userAgent的時候會有一些錯，我認為是項目請求網絡時需要緩存一些內容而導致的。

 

github地址：https://github.com/sea1234/fake-useragent