写一个libcurl请求https://www.baidu.com的带证书请求超级优化 最好初始化一次就好了 速度最快的封装get和post例子

以下是使用libcurl进行https请求的示例代码，包含初始化、GET和POST请求的封装，以及证书验证和超时设置的优化：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>

#define MAX_RESPONSE_SIZE 1024

// 初始化curl
void init_curl() {
    curl_global_init(CURL_GLOBAL_ALL);
}

// 释放curl
void cleanup_curl() {
    curl_global_cleanup();
}

// 执行GET请求
char* curl_get(const char* url, const char* cafile, int timeout) {
    CURL* curl = curl_easy_init();
    if (curl == NULL) {
        fprintf(stderr, "Failed to initialize curl.\n");
        return NULL;
    }

    // 设置URL
    curl_easy_setopt(curl, CURLOPT_URL, url);

    // 设置超时时间
    curl_easy_setopt(curl, CURLOPT_TIMEOUT, timeout);

    // 设置证书验证
    if (cafile != NULL) {
        curl_easy_setopt(curl, CURLOPT_CAINFO, cafile);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 2L);
    } else {
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
    }

    // 执行请求
    char* response = (char*)malloc(MAX_RESPONSE_SIZE);
    memset(response, 0, MAX_RESPONSE_SIZE);
    CURLcode res = curl_easy_perform(curl);
    if (res != CURLE_OK) {
        fprintf(stderr, "Failed to perform GET request: %s\n", curl_easy_strerror(res));
        free(response);
        curl_easy_cleanup(curl);
        return NULL;
    }

    // 获取响应内容
    long http_code = 0;
    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
    if (http_code == 200) {
        curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &http_code);
        printf("Response size: %ld\n", http_code);
        curl_easy_cleanup(curl);
        return response;
    }

    free(response);
    curl_easy_cleanup(curl);
    return NULL;
}

// 执行POST请求
char* curl_post(const char* url, const char* cafile, int timeout, const char* data) {
    CURL* curl = curl_easy_init();
    if (curl == NULL) {
        fprintf(stderr, "Failed to initialize curl.\n");
        return NULL;
    }

    // 设置URL
    curl_easy_setopt(curl, CURLOPT_URL, url);

    // 设置超时时间
    curl_easy_setopt(curl, CURLOPT_TIMEOUT, timeout);

    // 设置证书验证
    if (cafile != NULL) {
        curl_easy_setopt(curl, CURLOPT_CAINFO, cafile);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 2L);
    } else {
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
    }

    // 设置POST数据
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);

    // 执行请求
    char* response = (char*)malloc(MAX_RESPONSE_SIZE);
    memset(response, 0, MAX_RESPONSE_SIZE);
    CURLcode res = curl_easy_perform(curl);
    if (res != CURLE_OK) {
        fprintf(stderr, "Failed to perform POST request: %s\n", curl_easy_strerror(res));
        free(response);
        curl_easy_cleanup(curl);
        return NULL;
    }

    // 获取响应内容
    long http_code = 0;
    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
    if (http_code == 200) {
        curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &http_code);
        printf("Response size: %ld\n", http_code);
        curl_easy_cleanup(curl);
        return response;
    }

    free(response);
    curl_easy_cleanup(curl);
    return NULL;
}

int main() {
    init_curl();

    // 发送GET请求
    char* response = curl_get("https://www.baidu.com", "ca.crt", 10);
    if (response != NULL) {
        printf("Response content: %s\n", response);
        free(response);
    }

    // 发送POST请求
    const char* data = "name=John&age=30";
    response = curl_post("https://www.example.com", NULL, 10, data);
    if (response != NULL) {
        printf("Response content: %s\n", response);
        free(response);
    }

    cleanup_curl();
    return 0;
}

在上面的示例中，我们使用了以下一些优化技巧：

- 证书验证：如果传入了证书文件路径，就启用证书验证，否则禁用证书验证。
- 超时设置：设置了超时时间，避免因为等待响应而阻塞程序。
- 内存分配：在执行请求之前，先分配好一定大小的响应缓冲区，避免多次内存分配和释放的开销。

注意：以上示例仅供参考，实际使用需要根据具体情况进行调整。