c语言实现http客户端示例代码

好的，我可以提供一个示例代码：

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

#define HTTP_PORT 80

int main(int argc, char *argv[]) {
    if (argc != 2) {
        printf("Usage: %s <host>\n", argv[0]);
        exit(1);
    }

    char *host = argv[1];
    struct hostent *he = gethostbyname(host);
    if (he == NULL) {
        printf("Failed to resolve host %s\n", host);
        exit(1);
    }

    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1) {
        perror("socket");
        exit(1);
    }

    struct sockaddr_in server_addr = {
        .sin_family = AF_INET,
        .sin_port = htons(HTTP_PORT),
        .sin_addr = *((struct in_addr *)he->h_addr),
    };

    if (connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("connect");
        exit(1);
    }

    char request[1024];
    snprintf(request, sizeof(request), "GET / HTTP/1.1\r\nHost: %s\r\nConnection: close\r\n\r\n", host);

    if (send(sockfd, request, strlen(request), 0) == -1) {
        perror("send");
        exit(1);
    }

    char response[1024];
    int n;
    while ((n = recv(sockfd, response, sizeof(response) - 1, 0)) > 0) {
        response[n] = '\0';
        printf("%s", response);
    }

    if (n == -1) {
        perror("recv");
        exit(1);
    }

    close(sockfd);

    return 0;
}

这个代码使用了C语言的socket API来实现一个HTTP客户端，可以向指定的主机发送GET请求并获取响应。请注意，该示例代码并不是一个完整的、可靠的HTTP客户端实现，仅供参考和学习。