使用telnet理解http – Day Day Up ~

今天上计算机网络课，老师给讲解http协议。在最后演示的时候，使用telnet连接http服务的端口，并敲入http请求，看到了http服务返回的信息。不得不说这么一弄确实让我对http的理解又深了一层，对http基于tcp有了深刻的认识。捎带着对telnet的认识也清晰了，它就是在一个tcp连接下透明传输字节流的工具。上课时老师只写了Request line，没写其他的http头，服务器一直返回4xx，5xx错误，我回到宿舍亲自试了一遍，终于找到了原因，必须附加HOST头，不然无法请求成功。下面就贴出使用telnet发送的手写http请求(本地127.0.0.1的apache http服务)和服务器返回的信息：

Microsoft Windows [版本 6.2.9200]
(c) 2012 Microsoft Corporation。保留所有权利。
C:Userssharpbai>E:MinGWmsys1.0bintelnet.exe
telnet> open 127.0.0.1 80
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
GET / HTTP/1.0
HOST: 127.0.0.1

HTTP/1.1 200 OK
Date: Fri, 31 May 2013 02:49:57 GMT
Server: Apache/2.2.22 (Win32) PHP/5.4.15
X-Powered-By: PHP/5.4.15
Content-Length: 379
Connection: close
Content-Type: text/html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.or
g/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Up Up~</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="shortcut icon" href="favicon.ico" />
</head>
<body>
<p>
Welcome to Sharpbai's Site
</p>
</body>
</html>Connection closed by foreign host.

C:Userssharpbai>

Microsoft Windows [版本 6.2.9200]

C:Userssharpbai>E:MinGWmsys1.0bintelnet.exe

telnet> open 127.0.0.1 80

Trying 127.0.0.1...

Connected to 127.0.0.1.

Escape character is '^]'.

GET / HTTP/1.0

HOST: 127.0.0.1

HTTP/1.1 200 OK

Date: Fri, 31 May 2013 02:49:57 GMT

Server: Apache/2.2.22 (Win32) PHP/5.4.15

X-Powered-By: PHP/5.4.15

Content-Length: 379

Connection: close

Content-Type: text/html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.or

g/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

</head>

<body>

<p>

Welcome to Sharpbai's Site

</p>

</body>

</html>Connection closed by foreign host.

C:Userssharpbai>

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