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Bug
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Resolution: Done
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P2: Important
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5.12.3, 5.13.0
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None
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Windows
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2a15ec72c0d088a5dca344df163fac73c24caa1f (qt/qtbase/5.12)
Its very related to the issue QTBUG-22177, which was resolved years ago.
We setup a proxy server and the default behaviour of that server is to disconnect the connection when required authentication on HTTP/1.1.
The header that Proxy returned is:
Connetion: Close \r\n Proxy-Connection: Close \r\n
Expected:
QT's QNetworkAccessManager reconnect to Proxy and send the authentication to Proxy.
Actual:
The signal proxyAuthenticationRequired never emitted and QNetworkAccessManager never reconnect to the Proxy.
What I found from QT 5.13.0 's source code:
bool willClose;
QByteArray proxyConnectionHeader = d->reply->headerField("Proxy-Connection");
// Although most proxies use the unofficial Proxy-Connection header, the Connection header
// from http spec is also allowed.
if (proxyConnectionHeader.isEmpty())
proxyConnectionHeader = d->reply->headerField("Connection");
if (proxyConnectionHeader.compare("close", Qt::CaseSensitive) == 0) {
willClose = true;
} else if (proxyConnectionHeader.compare("keep-alive", Qt::CaseInsensitive) == 0) {
willClose = false;
} else {
// no Proxy-Connection header, so use the default
// HTTP 1.1's default behaviour is to keep persistent connections
// HTTP 1.0 or earlier, so we expect the server to close
willClose = (d->reply->majorVersion() * 0x100 + d->reply->minorVersion()) <= 0x0100;
}
It seems already being refactored after this fix: https://codereview.qt-project.org/c/qt/qtbase/+/7484
The original one use the toLower to ignore the case:
proxyConnectionHeader = proxyConnectionHeader.toLower();
But the latest code (from QT 5.13.0) made some mistake (I guess):
proxyConnectionHeader.compare("close", Qt::CaseSensitive)
Attached Debug Info
I've saw the HTTP RFC spec and it defined:
Connection: close Connection: Keep-Alive
But why Qt use Qt::CaseSensitive only for the close header then use Qt::CaseInsensitive for the keep-alive one? I guess both of them should use Qt::CaseInsensitive to enlarge the compatibility of such non-standard proxies, thus the upper case "Close" header from our Proxy server could be handled properly.
