Crow/examples/example_catchall.cpp

#define CROW_MAIN
#include <crow.h>



int main()
{
    crow::SimpleApp app;

    CROW_ROUTE(app, "/")([](){return "Hello";});

    //Setting a custom route for any URL that isn't defined, instead of a simple 404.
    CROW_CATCHALL_ROUTE(app)
            ([](crow::response& res) {
                res.body = "The URL does not seem to be correct.";
                res.end();
            });

    app.port(18080).run();
}