Function to_lower_copy

libop/network/HttpClient.cpp:57–62

// --- string utilities ---

std::string to_lower_copy(std::string s) {
    std::transform(s.begin(), s.end(), s.begin(), [](unsigned char c) {
        return static_cast<char>(std::tolower(c));
    });
    return s;
}

bool starts_with_http(const std::string &url) {
    return url.rfind("http://", 0) == 0 || url.rfind("https://", 0) == 0;