复制GET / HTTP/1.1  Host: www.jd.com  Connection: keep-alive  User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML,整天 like Gecko) Chrome/83.0.4103.61 Safari/537.36  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9  1.2.3.4.5.