昨天试着在Ubuntu 下用C语言写了一个客户端，用来向WEB服务器上交请求并取回响应报文。

同时，这也是一个通用的基于IPv4的客户端程序例程。

[cpp]

/* socket test on linux main file.

*

* Author: Lesca

* License: GPL

*

*/

#include

#include

#include

#include

#include

#include

#include

#include

int main()

{

int socketfd;

int len;

struct sockaddr_in address;

int result;

const char request[] = "GET / HTTP/1.1\r\nHost: api\r\nConnection: close\r\n\r\n";

char buf;

// 定义套接字类型并命名套接字

socketfd = socket(AF_INET, SOCK_STREAM, 0);

perror("socketfd");

address.sin_family = AF_INET;

address.sin_addr.s_addr = inet_addr("127.0.0.1");

address.sin_port = htons(80);// 将短整型转为网络字节序

len = sizeof(address);

// 将这个套接字连接到服务器

result = connect(socketfd, (struct sockaddr *)&address, len);

if(result == -1) {

perror("oops: client1");

exit(1);

}

perror("connect");

// Linux中套接字的读写和文件没有区别(真是方便那！！)

write(socketfd, request, strlen(request));

perror("write");

while(read(socketfd, &buf, 1))

{

putchar(buf);

}

// 关闭套接字

close(socketfd);

exit(0);

}

[/cpp]

HTTP请求报文

GET / HTTP/1.1

Host: api// 这是笔者机器上的一个虚拟主机的名字

Connection: close

HTTP应答报文

[html]

HTTP/1.1 200 OK

Date: Tue, 01 Mar 2011 08:45:42 GMT

Server: Apache/2.2.14 (Ubuntu)

Last-Modified: Mon, 21 Feb 2011 05:31:27 GMT

ETag: "58d054-1b9-49cc42cdc49c0"

Accept-Ranges: bytes

Content-Length: 441

Vary: Accept-Encoding

Connection: close

Content-Type: text/html

Lesca’s References, documentations, specifications and APIs

Your broswer doesn’t support frames

[/html]

References:

[1] Neil Matthew, Richard Stones – Beginning Linux Programming 4th Edition