boost::asio::read() gets stuck when there's no internet

From: Child OfGod (rwmoekoe_at_[hidden])
Date: 2021-02-19 08:42:30

In TgBot library i use under MSVC++,
in tgbot/net/BoostHttpOnlySslClient.cpp,
a call to boost::asio::read() does not return when internet is disconnected
for a few minutes.

I would appreciate any help to get this resolved, i.e. for the read
function to return if it fails after some timeout has passed

the code block in the tgbot/net/BoostHttpOnlySslClient.cpp file:

[code]
string BoostHttpOnlySslClient::makeRequest(const Url& url, const
vector<HttpReqArg>& args) const {
    tcp::resolver resolver(_ioService);
    tcp::resolver::query query(url.host, "443");

    ssl::context context(ssl::context::tlsv12_client);
    context.set_default_verify_paths();
    ssl::stream<tcp::socket> socket(_ioService, context);
    connect(socket.lowest_layer(), resolver.resolve(query));

    #ifdef TGBOT_DISABLE_NAGLES_ALGORITHM
    socket.lowest_layer().set_option(tcp::no_delay(true));
    #endif //TGBOT_DISABLE_NAGLES_ALGORITHM
    #ifdef TGBOT_CHANGE_SOCKET_BUFFER_SIZE
    #if _arm64 || _WIN64 || __amd64__ || __x86_64__ || __MINGW64__ ||
__aarch64__ || __powerpc64__
    socket.lowest_layer().set_option(socket_base::send_buffer_size(65536));

socket.lowest_layer().set_option(socket_base::receive_buffer_size(65536));
    #else //for 32-bit
    socket.lowest_layer().set_option(socket_base::send_buffer_size(32768));

socket.lowest_layer().set_option(socket_base::receive_buffer_size(32768));
    #endif //Processor architecture
    #endif //TGBOT_CHANGE_SOCKET_BUFFER_SIZE
    socket.set_verify_mode(ssl::verify_none);
    socket.set_verify_callback(ssl::rfc2818_verification(url.host));

    socket.handshake(ssl::stream<tcp::socket>::client);

    string requestText = _httpParser.generateRequest(url, args, false);
    write(socket, buffer(requestText.c_str(), requestText.length()));

    string response;

    #ifdef TGBOT_CHANGE_READ_BUFFER_SIZE
    #if _M_ARM64 || _WIN64 || __amd64__ || __x86_64__ || __MINGW64__ ||
__aarch64__ || __powerpc64__
    char buff[65536];
    #else //for 32-bit
    char buff[32768];
    #endif //Processor architecture
    #else
    char buff[1024];
    #endif //TGBOT_CHANGE_READ_BUFFER_SIZE

    boost::system::error_code error;
    while (!error) {
        std::size_t bytes = read(socket, buffer(buff), error);
        response += string(buff, bytes);
    }

    return _httpParser.extractBody(response);
}
[/code]

Thankyou in advance😀🙏