QNetworkAccessManager: Support HTTP redirection

This commit adds support for following HTTP redirect responses on a per
request basis.

This behavior is disabled by default. It can be switched on by
setting the QNetworkRequest::FollowRedirectAttribute to true.

2 new error codes have been added to QNetworkReply:

* TooManyRedirectsError: Set when the number of redirects exceed a
given value set by the user (defaults to 50 if not set)

* UnsecureRedirectError: Set when we are redirecting from a 'https'
to 'http' protocol.

Test cases for the following scenarios:
* Single HTTP redirect using local test server
* Changing max-redirects
* Testing all redirect related error scenarios

The next commit will extend this feature at a QNAM level.

Task-number: QTBUG-8232
Change-Id: If9e28ad12bad08bcdc5bc511b1cd59dc9d8150f0
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@theqtcompany.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/network/access/qhttpnetworkconnectionchannel.cpp b/src/network/access/qhttpnetworkconnectionchannel.cpp
index 75888c0062..82e573095b 100644
--- a/src/network/access/qhttpnetworkconnectionchannel.cpp
+++ b/src/network/access/qhttpnetworkconnectionchannel.cpp
@@ -492,6 +492,20 @@ void QHttpNetworkConnectionChannel::handleStatus()
     bool resend = false;
 
     switch (statusCode) {
+    case 301:
+    case 302:
+    case 303:
+    case 305:
+    case 307: {
+        // Parse the response headers and get the "location" url
+        QUrl redirectUrl;
+        if (connection->d_func()->parseRedirectResponse(socket, reply, &redirectUrl))
+            reply->setRedirectUrl(redirectUrl);
+
+        if (qobject_cast<QHttpNetworkConnection *>(connection))
+            QMetaObject::invokeMethod(connection, "_q_startNextRequest", Qt::QueuedConnection);
+        break;
+    }
     case 401: // auth required
     case 407: // proxy auth required
         if (connection->d_func()->handleAuthenticateChallenge(socket, reply, (statusCode == 407), resend)) {