Send User-Agent from the network request in http proxy CONNECT command

Some proxies can discriminate based on the User-Agent when sent a
CONNECT command for establishing a HTTPS connection.
With this change, if the User-Agent header is set in the QNetworkRequest
then it will be passed to the http socket engine for use in the connect
command sent to the proxy.
As before, "Mozilla/5.0" will be used by default when no user agent
has been set.

Task-number: QTBUG-17223
Reviewed-by: Markus Goetz

1 files changed, 6 insertions, 0 deletions

diff --git a/src/network/access/qhttpnetworkconnectionchannel.cpp b/src/network/access/qhttpnetworkconnectionchannel.cpp
index 6fbc6f8056..b738ccf361 100644
--- a/src/network/access/qhttpnetworkconnectionchannel.cpp
+++ b/src/network/access/qhttpnetworkconnectionchannel.cpp
@@ -579,6 +579,12 @@ bool QHttpNetworkConnectionChannel::ensureConnection()
             connectHost = connection->d_func()->networkProxy.hostName();
             connectPort = connection->d_func()->networkProxy.port();
         }
+        if (socket->proxy().type() == QNetworkProxy::HttpProxy) {
+            // Make user-agent field available to HTTP proxy socket engine (QTBUG-17223)
+            QByteArray value = request.headerField("user-agent");
+            if (!value.isEmpty())
+                socket->setProperty("_q_user-agent", value);
+        }
 #endif
         if (ssl) {
 #ifndef QT_NO_OPENSSL