给scrapy设置HTTP代理
在scrapy项目文件下建立一个.py文件 填入以下信息：
# 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://proxyIP: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在setting中加入以下代码：（其中project_name自行替换后面跟上建立的.py文件路径，最后加上cls名）
DOWNLOADER_MIDDLEWARES = {
'scrapy.contrib.downloadermiddleware.httpproxy.HttpProxyMiddleware': 110,
'project_name.middlewares.ProxyMiddleware': 100,
}
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