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, 3 insertions, 0 deletions

diff --git a/src/network/access/qhttpthreaddelegate.cpp b/src/network/access/qhttpthreaddelegate.cpp
index be6fa01098..3fc4fa9dee 100644
--- a/src/network/access/qhttpthreaddelegate.cpp
+++ b/src/network/access/qhttpthreaddelegate.cpp
@@ -496,6 +496,9 @@ void QHttpThreadDelegate::finishedSlot()
             emit error(statusCodeFromHttp(httpReply->statusCode(), httpRequest.url()), msg);
         }
 
+    if (httpRequest.isFollowRedirects() && httpReply->isRedirecting())
+        emit redirected(httpReply->redirectUrl(), httpReply->statusCode(), httpReply->request().redirectCount() - 1);
+
     emit downloadFinished();
 
     QMetaObject::invokeMethod(httpReply, "deleteLater", Qt::QueuedConnection);