drogon/examples/benchmark/BenchmarkCtrl.cc

#include "BenchmarkCtrl.h"
void BenchmarkCtrl::asyncHandleHttpRequest(const HttpRequestPtr& req,const std::function<void (const HttpResponsePtr &)> & callback)
{
    //write your application logic here
    auto resp = HttpResponse::newHttpResponse();
    resp->setBody("<p>Hello, world!</p>");
    resp->setExpiredTime(0);
    callback(resp);
}