<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[asyncdragon的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/asyncdragon</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; asyncdragon]]></copyright><item><title><![CDATA[爬虫网站登录初体验]]></title><link>https://blog.youkuaiyun.com/asyncdragon/article/details/117561600</link><guid>https://blog.youkuaiyun.com/asyncdragon/article/details/117561600</guid><author>asyncdragon</author><pubDate>Fri, 04 Jun 2021 15:38:13 +0800</pubDate><description><![CDATA[1，事件的开端是这样的




]]></description><category></category></item><item><title><![CDATA[scrapy 下载中间件的调度与返回]]></title><link>https://blog.youkuaiyun.com/asyncdragon/article/details/116496572</link><guid>https://blog.youkuaiyun.com/asyncdragon/article/details/116496572</guid><author>asyncdragon</author><pubDate>Fri, 07 May 2021 17:49:08 +0800</pubDate><description><![CDATA[scrapy下载中间件的调用顺序以及返回值
本篇博文用以探索scrapy运行时调用下载中间件的调用顺序以及相应的返回值时的变化。
步骤1
运行一个正常的scrapy爬虫程序，示例代码如下`
import scrapy
class Test1Spider(scrapy.Spider):
name = ‘test1’
start_urls = [‘http://www.baidu.com/’]
def parse(self, response):
    print('spider运行')

if name =]]></description><category></category></item></channel></rss>