Embedding http server inside thrift server

#include <iostream>
#include "gen-cpp2/Calculator.h"
#include <thrift/lib/cpp2/server/ThriftServer.h>

using namespace std;
using namespace apache::thrift;
using namespace example::cpp2;

class CalculatorSvc : public CalculatorSvIf
{
 public:
  virtual ~CalculatorSvc() {}
  void async_tm_add(
    std::unique_ptr<apache::thrift::HandlerCallback<int64_t>> callback,
    int32_t num1,
    int32_t num2)
  {
    cout << "Got async request " << num1 << " + " << num2 << endl;
    callback->result(num1 + num2);
  }
};

// httpHandler is called whenever a http request is received by thrift server
void httpHandler(
  apache::thrift::async::TEventBase* ev,
  std::shared_ptr<apache::thrift::async::TAsyncTransport> tr,
  std::unique_ptr<folly::IOBuf> buf)
{
  /*
  buf: contains the request header raw data. To get the request detail
  you must use some http request header parser.

  The response has to be written in tr. This is basically a socket.
  */
  std::cout << "Got http request" << std::endl;
  // Create http response. A better approach will be to use some http response builder
  // But for this example, we are directly preparing raw response
  std::string resp = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nContent-Length: 11\r\n\r\nHello World";
  tr->write(nullptr, resp.c_str(), resp.size());
}

int main(int argc, char **argv) {
  ThriftServer* s = new ThriftServer();
  getHandlerFunc hf = httpHandler;
  // Set http handler
  s->setGetHandler(hf);
  std::shared_ptr<CalculatorSvc> ptr(new  CalculatorSvc());
  s->setInterface(ptr);
  s->setPort(8080);
  s->serve();
  return 0;
}