drogon_ctl create project CrashExample
cd CrashExample/controllers
drogon_ctl create controller ExceptionalController

// ExceptionalController.h
#pragma once

#include <drogon/HttpSimpleController.h>

using namespace drogon;

class ExceptionalController : public drogon::HttpSimpleController<ExceptionalController>
{
  public:
    ExceptionalController() {
      throw std::runtime_error("I'm exceptional, and therefore won't start. That should be fine.");
    }

    void asyncHandleHttpRequest(const HttpRequestPtr& req, std::function<void (const HttpResponsePtr &)> &&callback) override;
    PATH_LIST_BEGIN
    // list path definitions here;
    //PATH_ADD("/path", "filter1", "filter2", HttpMethod1, HttpMethod2...);

    PATH_ADD("/crash", Get);
    PATH_LIST_END
};

//main.cc

#include <drogon/drogon.h>
int main() {
    //Set HTTP listener address and port
    drogon::app().addListener("0.0.0.0",80);
    //Load config file
    //drogon::app().loadConfigFile("../config.json");
    //Run HTTP framework,the method will block in the internal event loop
    try {
        drogon::app().run();
    } catch (std::exception & e) {
        std::cout << "Caught exception \"" << e.what() << "\"... this is exiting.\n";
    }

    std::cout << "Press enter to exit...\n";
    std::getchar();

    return 0;
}

20220926 06:35:01.622763 UTC 41933 WARN  Exception thrown from event loop, rethrowing after running functions on quit - EventLoop.cc:243
20220926 06:35:01.623295 UTC 41933 WARN  Rethrowing exception from event loop - EventLoop.cc:260
Caught exception "I'm exceptional, and therefore won't start. That should be fine."... this is exiting.
Press enter to exit...

20220926 06:35:01.622763 UTC 41933 WARN  Exception thrown from event loop, rethrowing after running functions on quit - EventLoop.cc:243
20220926 06:35:01.623295 UTC 41933 WARN  Rethrowing exception from event loop - EventLoop.cc:260
Caught exception "I'm exceptional, and therefore won't start. That should be fine."... this is exiting.
Press enter to exit...

20220926 06:35:05.766527 UTC 41933 FATAL It is forbidden to run loop on threads other than event-loop thread - EventLoop.cc:266