GET /index.html HTTP/1.1
Host: www.example.com User-Agent: Mozilla/5.0 Accept: text/html Content-Type: application/json Content-Length: 128
{"username": "admin", "password": "123456"}
HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8 Content-Length: 2048 Server: nginx/1.20.1 Date: Fri, 24 Apr 2026 16:00:00 GMT Set-Cookie: session_id=abc123
<html> <head><title>Example</title></head> <body>Hello World!</body> </html>
通用格式 (请求和响应都适用)：
起始行/状态行 + CRLF +
头部 (Header 1) + CRLF +
头部 (Header 2) + CRLF +
... +
CRLF (空行分隔) +
Body (请求体/响应体)