這是一個瀏覽器默認的請求
GET / HTTP/1.1
Host: 192.168.1.45:8080
Connection: keep-alive
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 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
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
實際上一個最簡單的響應只需要包含一個狀態碼和內容長度，和正文內容了。
HTTP/1.1 200 OK
Content-Length: 14
<html>M</html>
顯示效果如圖：
