获取请求消息中所有头字段(杜老师)
accept : */*
user-agent : Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
accept-encoding : gzip, br, zstd, deflate
host : 47.93.244.195:8080
via : 1.1 squid-proxy-5b5d847c96-8c4dc (squid/6.10)
x-forwarded-for : 10.1.34.149
cache-control : max-age=259200
connection : keep-alive