Get bad request from Google calendar API - c++

Question

I'm trying to insert an event to google calendar using Qt C++.
Before inserting events, I am able to clear the primary calendar using these lines
const QUrl clearPrimaryUrl("https://www.googleapis.com/calendar/v3/calendars/primary/clear");
void GoogleWrapper::clearPrimaryCalendar()
{
QNetworkReply *reply = google.post(clearPrimaryUrl);
connect(reply, &QNetworkReply::finished, [=]()
{
reply->deleteLater();
if(reply->error() != QNetworkReply::NoError)
{
qCritical() << "Google error:" << reply->errorString();
return;
}
emit primaryCalendarCleared();
});
}
google is an QOAuth2AuthorizationCodeFlow object.
Now to insert events, I use these lines:
const QUrl insertEventUrl("https://www.googleapis.com/calendar/v3/calendars/primary/events");
void GoogleWrapper::insertEvent(const QByteArray &eventData)
{
qDebug() << eventData;
QNetworkReply *reply = google.post(insertEventUrl, eventData);
connect(reply, &QNetworkReply::finished, [=]()
{
reply->deleteLater();
if(reply->error() != QNetworkReply::NoError)
{
qCritical() << "Google error:" << reply->errorString();
return;
}
emit eventInserted();
});
}
But the output I received from qCritical was always Error transferring https://www.googleapis.com/calendar/v3/calendars/primary/events - server replied: Bad Request.
I tried output the eventData to a file and copy paste it to Google's try this API and the below json data works perfectly
{
"description": "some teacher name",
"end": {
"dateTime": "2018-12-19T11:15:00Z"
},
"location": "Room",
"start": {
"dateTime": "2018-12-19T09:30:00Z"
},
"summary": "Subject Name"
}
Anyone have any idea what I did wrong?

Answer 1

The issue is solved thanks to #thuga's comment.
My code was missing the line
google.setContentType(QAbstractOAuth2::ContentType::Json);