状态码大全，你知道几个？

• HTTP 400 – 请求无效
• HTTP 401.1 – 未授权：登录失败
• HTTP 401.2 – 未授权：服务器配置问题导致登录失败
• HTTP 401.3 – ACL 禁止访问资源
• HTTP 401.4 – 未授权：授权被筛选器拒绝
• HTTP 401.5 – 未授权：ISAPI 或 CGI 授权失败
• HTTP 403 – 禁止访问
• HTTP 403 – 对 Internet 服务管理器 (HTML) 的访问仅限于 Localhost
• HTTP 403.1 禁止访问：禁止可执行访问
• HTTP 403.2 – 禁止访问：禁止读访问
• HTTP 403.3 – 禁止访问：禁止写访问
• HTTP 403.4 – 禁止访问：要求 SSL
• HTTP 403.5 – 禁止访问：要求 SSL 128
• HTTP 403.6 – 禁止访问：IP 地址被拒绝
• HTTP 403.7 – 禁止访问：要求客户证书
• HTTP 403.8 – 禁止访问：禁止站点访问
• HTTP 403.9 – 禁止访问：连接的用户过多
• HTTP 403.10 – 禁止访问：配置无效
• HTTP 403.11 – 禁止访问：密码更改
• HTTP 403.12 – 禁止访问：映射器拒绝访问
• HTTP 403.13 – 禁止访问：客户证书已被吊销
• HTTP 403.15 – 禁止访问：客户访问许可过多
• HTTP 403.16 – 禁止访问：客户证书不可信或者无效
• HTTP 403.17 – 禁止访问：客户证书已经到期或者尚未生效
• HTTP 404.1 – 无法找到 Web 站点
• HTTP 404 – 无法找到文件
• HTTP 405 – 资源被禁止
• HTTP 406 – 无法接受
• HTTP 407 – 要求代理身份验证
• HTTP 410 – 永远不可用
• HTTP 412 – 先决条件失败
• HTTP 414 – 请求 – URI 太长
• HTTP 500 – 内部服务器错误
• HTTP 500.100 – 内部服务器错误 – ASP 错误
• HTTP 500-11 服务器关闭
• HTTP 500-12 应用程序重新启动
• HTTP 500-13 – 服务器太忙
• HTTP 500-14 – 应用程序无效
• HTTP 500-15 – 不允许请求 global.asa
• Error 501 – 未实现
• HTTP 502 – 网关错误
  

（1）打开“控制面板”——>“所有控制面板项”——>“程序和功能”

（2）找到“Internet信息服务”在前面的选框里打钩

客户端代码

client.cpp

#include <stdlib.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdio.h>

int main() {

	//创建一个socket
	int sock_fd = socket(AF_INET, SOCK_STREAM, 0);

	//创建好地址
	struct sockaddr_in address;
	address.sin_family = AF_INET;
	address.sin_port = htons(1991); //端口和服务器端对应
	address.sin_addr.s_addr = inet_addr("127.0.0.1");

	//开始连接服务器
	int result = connect(sock_fd, (struct sockaddr *) &address, sizeof(address));

	if(result == -1){
		perror("connect failed: ");
		exit(1);
	}

	char ch = 'A';
	//给服务器发送 一个字符
	write( sock_fd, &ch, 1);
	printf("client says: %c\n", ch);

	// 读取一个字符
	read(sock_fd, &ch, 1);
	printf("get char from server:%c\n", ch);

	//关掉连接
	close(sock_fd);


	return 0;
}

服务器端

server.cpp

#include <stdlib.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdio.h>

int main() {

	//用 SOCK_STREAM 标识建立 TCP连接
	int sockfd = socket(AF_INET, SOCK_STREAM, 0);

	struct sockaddr_in server_addr;
	server_addr.sin_family = AF_INET;
	server_addr.sin_port = htons(1991); //需要转化字节序

	//需要把点分10进制的地址转化
	/*
	 * Name: inet_addr
	 Prototype: uint32_t inet_addr (const char *name)
	 Description:
	 This function converts the IPv4 Internet host address name from the standard numbers-and-dots notation
	 into binary data. If the input is not valid, inet_addr returns INADDR_NONE. This is an obsolete interface to
	 inet_aton, described immediately above. It is obsolete because INADDR_NONE is a valid address
	 (255.255.255.255), and inet_aton provides a cleaner way to indicate error return.
	 */
	server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

	/*绑定*/
	bind(sockfd, (struct sockaddr *) &server_addr, sizeof(server_addr));

	/*
	 * Name: listen
	 Prototype: int listen (int socket, int n)
	 Description:
	 The listen function enables the socket socket to accept connections, thus making it a server socket.

	 The argument n specifies the length of the queue for pending connections. When the queue fills, new
	 clients attempting to connect fail with ECONNREFUSED until the server calls accept to accept a
	 connection from the queue.

	 The listen function returns 0 on success and -1 on failure. The following errno error conditions are defined
	 for this function:
	 */
	listen(sockfd, 10);

	char ch;

	struct sockaddr_in client_addr;
	socklen_t len = sizeof(client_addr);
//	socklen_t len = 0;
	while(1)
	{
		int client_sockfd;
		printf("server waiting: \n");
		client_sockfd = accept(sockfd, (struct sockaddr *) &client_addr, &len);

		//只读取一个字符
		read(client_sockfd, &ch, 1);
		printf("get char from client: %c\n", ch);
		++ch;

		//把该字符 +1后再发回给客户端
		write(client_sockfd, &ch, 1);

		close(client_sockfd);
	}

	//printf("%0x", server_addr.sin_addr.s_addr);
	return 0;
}