package com.fastcampus.ch2;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class RequestHeader {
	@RequestMapping("/requestHeader")
	public void main(HttpServletRequest request) {
		
		Enumeration<String> e = request.getHeaderNames();

		while (e.hasMoreElements()) {
			String name = e.nextElement();
			System.out.println(name + ":" + request.getHeader(name));
		}
	}
}

[실행결과]
host:localhost:8080
connection:keep-alive
sec-ch-ua:"Chromium";v="94", "Google Chrome";v="94", ";Not A Brand";v="99"
sec-ch-ua-mobile:?0
sec-ch-ua-platform:"macOS"
upgrade-insecure-requests:1
user-agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36
accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
sec-fetch-site:none
sec-fetch-mode:navigate
sec-fetch-user:?1
sec-fetch-dest:document
accept-encoding:gzip, deflate, br
accept-language:ko-KR,ko;q=0.9,en-US;q=0.8,en;q=0.7