v2ray | transparent proxy ' is a proxy that does not modify | Proxy library

typedef struct ResponseBody {
    size_t memorySize = BUFSIZ;
    size_t dataSize{};
    char *bodyMemory = new char[BUFSIZ];

public:
    ~ResponseBody();
} ResponseBody;

ResponseBody::~ResponseBody() {
    delete[] this->bodyMemory;
}

size_t get_containers_callback(const char *buff, size_t size, size_t buff_size, void *data) {
    auto *body = (ResponseBody *) data;

    size_t needMemory = body->dataSize + buff_size;
    if (needMemory > body->memorySize) {
        auto *newMemory = new char[needMemory];
        strcpy(newMemory, body->bodyMemory);
        delete[] body->bodyMemory;
        body->bodyMemory = newMemory;
        body->memorySize = needMemory;
    }

    memcpy(body->bodyMemory + body->dataSize, buff, buff_size);
    body->dataSize += buff_size;
    return size * buff_size;
}

int main() {
    auto *responseBody = new ResponseBody;
    curl_easy_setopt(curl, CURLOPT_URL, "http://localhost:8080/containers/json?all=true");

curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, get_containers_callback);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, responseBody);

    res = curl_easy_perform(curl);
    if (res == CURLE_OK) {
        fprintf(stdout, "%s\n", responseBody->bodyMemory);
    }
    return 0;
}