c++怎么实现一个简单的HTTP客户端_c++网络请求与数据交互实例

#include <iostream>
#include <string>
#include <cstring>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
<p>std::string httpGet(const std::string& host, const std::string& path) {
struct addrinfo hints, *res;
int sockfd;
ssize_t bytes;
char buf[4096];
std::string request, response;</p><pre class='brush:php;toolbar:false;'>// 设置地址信息
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;

// 解析域名
if (getaddrinfo(host.c_str(), "80", &hints, &res) != 0) {
    return "Error:无法解析域名";
}

// 创建socket
sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (sockfd == -1) {
    freeaddrinfo(res);
    return "Error:创建socket失败";
}

// 连接服务器
if (connect(sockfd, res->ai_addr, res->ai_addrlen) == -1) {
    close(sockfd);
    freeaddrinfo(res);
    return "Error:连接失败";
}

// 构造HTTP请求
request = "GET " + path + " HTTP/1.1\r\n";
request += "Host: " + host + "\r\n";
request += "Connection: close\r\n";
request += "User-Agent: simple-cpp-client/1.0\r\n";
request += "\r\n";

// 发送请求
if (send(sockfd, request.c_str(), request.size(), 0) == -1) {
    close(sockfd);
    freeaddrinfo(res);
    return "Error:发送请求失败";
}

// 接收响应
while ((bytes = recv(sockfd, buf, sizeof(buf) - 1, 0)) > 0) {
    buf[bytes] = '\0';
    response += buf;
}

close(sockfd);
freeaddrinfo(res);

return response;

g++ http_client.cpp -o http_client

HTTP/1.1 200 OK
Date: Mon, 01 Jan 2024 00:00:00 GMT
Content-Type: application/json
...
<p>{
"origin": "123.45.67.89"
}</p>