libmicrohttpd在html响应中发送垃圾(const char*vs std::字符串.数据() )

当我使用 std::字符串的数据()

工作正常:

    const char* html2 = "Free for personal and commercial use under the CCA 3.0 license";
    response = MHD_create_response_from_buffer(strlen(html2), (void *) html2, MHD_RESPMEM_PERSISTENT);

发送垃圾邮件:

    std::string html = "Free for personal and commercial use under the CCA 3.0 license";
     response = MHD_create_response_from_buffer(strlen(html.data()), (void *) html.data(), MHD_RESPMEM_PERSISTENT);