python crawler Scrapy uses proxy configuration

When crawling website content, the most common problem encountered is: the website has restrictions on IP and has anti-crawling functions. The best way is to rotate IP crawling (adding a proxy)

Let’s talk about Scrapy How to configure the agent and crawl

1. Create a new "middlewares.py" under the Scrapy project

# Importing base64 library because we'll need it ONLY in case if the proxy we are going to use requires authentication
import base64 
# 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 = base64.encodestring(proxy_user_pass)
        request.headers['Proxy-Authorization'] = 'Basic ' + encoded_user_pass

2. Add

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

to the project configuration file (./pythontab/settings.py)