Python crawler Scrapy using proxy configuration

Scrapy of python crawlers uses proxy configurations to crawl website content. The most common problem is that websites have IP restrictions and have anti-crawling functions, the best solution is IP rotation crawling (with proxy)

Next let's take a look at how Scrapy configures a proxy for crawling.

1. create "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 authenticationimport base64 # Start your middleware classclass 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. in the project configuration file (./pythontab/settings. py), add

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