python爬虫之Scrapy使用代理配置

下面来说一下Scrapy如何配置代理，进行抓取

1.在Scrapy工程下新建“middlewares.py”

# Importing base library because we'll need it ONLY in case if the proxy we are going to use requires authentication
import base 
# Start your middleware class
class ProxyMiddleware(object):
 # overwrite process request
 def process_request(self, request, spider):
 # Set the location of the proxy
 request.meta['proxy'] = "http://YOUR_PROXY_IP:PORT"
 
 # Use the following lines if your proxy requires authentication
 proxy_user_pass = "USERNAME:PASSWORD"
 # setup basic authentication for the proxy
 encoded_user_pass = base.encodestring(proxy_user_pass)
 request.headers['Proxy-Authorization'] = 'Basic ' + encoded_user_pass

2.在项目配置文件里(./pythontab/settings.py)添加

DOWNLOADER_MIDDLEWARES = {
 'scrapy.contrib.downloadermiddleware.httpproxy.HttpProxyMiddleware': 110,
 'pythontab.middlewares.ProxyMiddleware': 100,
}