Use HTTP2WasUsedAttribute for HTTP2

Previously we were always setting SpdyWasUsedAttribute for SPDY/HTTP/2/HTTP/1.1
(true/false) which is confusing. Now if HTTP2AllowedAttribute was set to true on
a request, we set HTTP2WasUsedAttribute. Otherwise, as we did before, we're setting
SpdyWasUsedAttribute.

Change-Id: I0c44cfb5469fef0c12719baa951197ee2accee4a
Reviewed-by: Markus Goetz (Woboq GmbH) <markus@woboq.com>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/network/access/qhttp2protocolhandler.cpp

@@ -1387,6 +1387,8 @@ void QHttp2ProtocolHandler::initReplyFromPushPromise(const HttpMessagePair &mess
 {
     Q_ASSERT(promisedData.contains(cacheKey));
     auto promise = promisedData.take(cacheKey);
+    Q_ASSERT(message.second);
+    message.second->setSpdyWasUsed(true);
 
     qCDebug(QT_HTTP2) << "found cached/promised response on stream" << promise.reservedID;
 

src/network/access/qnetworkreplyhttpimpl.cpp

@@ -1234,7 +1234,14 @@ void QNetworkReplyHttpImplPrivate::replyDownloadMetaData(const QList<QPair<QByte
     }
 
     q->setAttribute(QNetworkRequest::HttpPipeliningWasUsedAttribute, pu);
-    q->setAttribute(QNetworkRequest::SpdyWasUsedAttribute, spdyWasUsed);
+    const QVariant http2Allowed = request.attribute(QNetworkRequest::HTTP2AllowedAttribute);
+    if (http2Allowed.isValid() && http2Allowed.toBool()) {
+        q->setAttribute(QNetworkRequest::HTTP2WasUsedAttribute, spdyWasUsed);
+        q->setAttribute(QNetworkRequest::SpdyWasUsedAttribute, false);
+    } else {
+        q->setAttribute(QNetworkRequest::SpdyWasUsedAttribute, spdyWasUsed);
+        q->setAttribute(QNetworkRequest::HTTP2WasUsedAttribute, false);
+    }
 
     // reconstruct the HTTP header
     QList<QPair<QByteArray, QByteArray> > headerMap = hm;

src/network/access/qnetworkrequest.cpp

@@ -266,7 +266,10 @@ QT_BEGIN_NAMESPACE
         allowed to use HTTP/2 with this request. This applies
         to SSL requests or 'cleartext' HTTP/2.
 
-    \omitvalue HTTP2WasUsedAttribute
+    \value HTTP2WasUsedAttribute
+        Replies only, type: QMetaType::Bool (default: false)
+        Indicates whether HTTP/2 was used for receiving this reply.
+        (This value was introduced in 5.9.)
 
     \value EmitAllUploadProgressSignalsAttribute
         Requests only, type: QMetaType::Bool (default: false)

tests/auto/network/access/http2/tst_http2.cpp

@@ -590,8 +590,15 @@ void tst_Http2::replyFinished()
 {
     QVERIFY(nRequests);
 
-    if (const auto reply = qobject_cast<QNetworkReply *>(sender()))
+    if (const auto reply = qobject_cast<QNetworkReply *>(sender())) {
         QCOMPARE(reply->error(), QNetworkReply::NoError);
+        const QVariant http2Used(reply->attribute(QNetworkRequest::HTTP2WasUsedAttribute));
+        QVERIFY(http2Used.isValid());
+        QVERIFY(http2Used.toBool());
+        const QVariant spdyUsed(reply->attribute(QNetworkRequest::SpdyWasUsedAttribute));
+        QVERIFY(spdyUsed.isValid());
+        QVERIFY(!spdyUsed.toBool());
+    }
 
     --nRequests;
     if (!nRequests && serverGotSettingsACK)