给我一份c语言写的socket实现http请求的代码，不使用http库

以下是一个简单的C语言程序，使用socket实现http请求：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>

#define MAX_BUF_SIZE 1024

int main(int argc, char *argv[]) {
    int sockfd, portno, n;
    struct sockaddr_in serv_addr;
    struct hostent *server;
    char buffer[MAX_BUF_SIZE];

    if (argc < 3) {
        fprintf(stderr,"usage %s hostname port\n", argv[0]);
        exit(0);
    }

    portno = atoi(argv[2]);

    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) {
        perror("ERROR opening socket");
        exit(1);
    }

    server = gethostbyname(argv[1]);
    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(0);
    }

    memset((char *)&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    memcpy((char *)&serv_addr.sin_addr.s_addr, (char *)server->h_addr, server->h_length);
    serv_addr.sin_port = htons(portno);

    if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        perror("ERROR connecting");
        exit(1);
    }

    char *request = "GET / HTTP/1.1\r\nHost: %s\r\n\r\n";
    sprintf(buffer, request, argv[1]);

    n = write(sockfd, buffer, strlen(buffer));
    if (n < 0) {
        perror("ERROR writing to socket");
        exit(1);
    }

    memset(buffer, 0, MAX_BUF_SIZE);

    n = read(sockfd, buffer, MAX_BUF_SIZE - 1);
    if (n < 0) {
        perror("ERROR reading from socket");
        exit(1);
    }

    printf("%s\n", buffer);

    close(sockfd);

    return 0;
}

该程序实现了一个简单的HTTP GET请求，发送给指定的主机和端口，然后读取服务器的响应并在控制台上输出。用户可以通过命令行参数指定主机名和端口号。程序使用了socket API来实现网络通信，不需要使用任何HTTP库。