获取请求消息中所有头字段(邢方源)
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 : 39.107.81.44:8080
via : 1.1 squid-proxy-5b5d847c96-8p9zn (squid/6.10)
x-forwarded-for : 10.3.215.66
cache-control : max-age=259200
connection : keep-alive