How do I read headers from a QNetworkReply - c++

Question

How can one read headers for example a cookie out of a QNetworkReply?

Answer 1

I just thought to add to the above answer concerning rawHeader
QList<QByteArray> headerList = reply->rawHeaderList();
foreach(QByteArray head, headerList) {
qDebug() << head << ":" << reply->rawHeader(head);
}

Answer 2

Consulting the documentation, there are a few methods related to reading headers: header, rawHeader, rawHeaderList, and rawHeaderPairs. For the specific case of getting a cookie, you can use the header method. It would look something like this:
QNetworkReply *reply;
// somehow give reply a value
QVariant cookieVar = reply.header(QNetworkRequest::CookieHeader);
if (cookieVar.isValid()) {
QList<QNetworkCookie> cookies = cookieVar.value<QList<QNetworkCookie> >();
foreach (QNetworkCookie cookie, cookies) {
// do whatever you want here
}
}
The header method only works for certain HTTP headers, though. In the general case, if there is no QNetworkRequest::KnownHeaders value for the header you want, the rawHeader method is probably the way to go.

Answer 3

I have tried the answer of Evan Shaw, but there is a little mistake.
The QNetworkRequest::CookieHeader need change to QNetworkRequest::SetCookieHeader. Because I found it is Set-Cookie in the header of QNetworkReply other than Cookie.
QNetworkReply *reply;
// somehow give reply a value
QVariant cookieVar = reply.header(QNetworkRequest::SetCookieHeader);
if (cookieVar.isValid()) {
QList<QNetworkCookie> cookies = cookieVar.value<QList<QNetworkCookie> >();
foreach (QNetworkCookie cookie, cookies) {
// do whatever you want here
}
}