struct WFGlobalSettings
{
    struct EndpointParams endpoint_params;
    struct EndpointParams dns_server_params;
    unsigned int dns_ttl_default;   ///< in seconds, DNS TTL when network request success
    unsigned int dns_ttl_min;       ///< in seconds, DNS TTL when network request fail
    int dns_threads;
    int poller_threads;
    int handler_threads;
    int compute_threads;            ///< auto-set by system CPU number if value<=0
    const char *resolv_conf_path;
    const char *hosts_path;
};


static constexpr struct WFGlobalSettings GLOBAL_SETTINGS_DEFAULT =
{
    .endpoint_params    =   ENDPOINT_PARAMS_DEFAULT,
    .dns_server_params  =   ENDPOINT_PARAMS_DEFAULT,
    .dns_ttl_default    =   12 * 3600,
    .dns_ttl_min        =   180,
    .dns_threads        =   4,
    .poller_threads     =   4,
    .handler_threads    =   20,
    .compute_threads    =   -1,
    .resolv_conf_path   =   "/etc/resolv.conf",
    .hosts_path         =   "/etc/hosts",
};

struct EndpointParams
{
    size_t max_connections;
    int connect_timeout;
    int response_timeout;
    int ssl_connect_timeout;
    bool use_tls_sni;
};

static constexpr struct EndpointParams ENDPOINT_PARAMS_DEFAULT =
{
    .max_connections        = 200,
    .connect_timeout        = 10 * 1000,
    .response_timeout       = 10 * 1000,
    .ssl_connect_timeout    = 10 * 1000,
    .use_tls_sni            = false,
};

#include "workflow/WFGlobal.h"

int main()
{
    struct WFGlobalSettings settings = GLOBAL_SETTINGS_DEFAULT;

    settings.endpoint_params.connect_timeout = 5 * 1000;
    settings.dns_ttl_default = 3600;
    settings.poller_threads = 10;
    WORKFLOW_library_init(&settings);

    ...
}