SSL certificate error occurs when we crawl HTTPS sites
HTTPS in plain English is our HTTP + SSL (certificate), some small companies make their own SSL, so sometimes when we visit the website of some small companies it will remind us to download some SSL certificates, and the website that we don’t have to download has been CA certified
we are going to crawl an SSL certificate that is not a CA certified web address to verify.
when we climb to find the problem of error. 
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