How to use QHttpServer missing handler?

[Tarae]

Hi, I cannot figure out, how to use the missing handler in QHttpServer. My server:

//QT = core httpserver
#include <QCoreApplication>
#include <QDebug>
#include <QHttpServer>

void missingHandler(const QHttpServerRequest & request, QHttpServerResponder && responder)
{
  qWarning() << "invalid http request" << request.url().path();
  responder.writeBody("Oh no! Invalid request!");
  responder.write(QHttpServerResponder::StatusCode::NotFound);
}

int main(int argc, char *argv[])
{
  QCoreApplication a(argc, argv);
  QHttpServer server;
  server.setMissingHandler(missingHandler);
  server.route("/foo", [] () { return "foo"; });
  server.listen(QHostAddress::Any, 1234);
  qInfo() << "server running";
  return a.exec();
}

What it does:

$ curl localhost:1234/foo
foo
$ curl localhost:1234/bar
curl: (1) Received HTTP/0.9 when not allowed

What am I doing wrong? I can't find any example where a missing handler is used.
Thank you for your help.

[JonB]

@Tarae
It would help if you said whether your missingHandler() gets called or not!

While you await a better C++ expert than I: where you call server.setMissingHandler(missingHandler); do you not need to wrap missingHandler in a std::function? The signature requires

std::function<void(const QHttpServerRequest &request, QHttpServerResponder &&responder)>.

I'm not sure that a plain function name is the same thing as that. Then again, you didn't geta compile error, so who knows.....

Does something like:

server.setMissingHandler([]() { qDebug() << "Help me"; })

get through?

[Tarae]

@JonB It calls the function, the message 'invalid http request...' is printed out to the console. Just curl doesn't like the response.

[JonB]

@Tarae
Oh, you mean just you want to know what to put in the body of missingHandler() to not cause that. I did not understand that was your issue from the question.

Since Content-type will be "application/x-empty" I don't suppose just removing responder.writeBody() makes it any better?

I take it you know what curl will show.

Anyway I leave it to you now, sorry.