QNAM HTTP: Fix bug with explicitly zero-length compressed responses.

In the case of a response with e.g content-encoding "gzip" and
content-length "0", the HTTP backend would incorrectly fall back to
the "unspecified length" code path and wait for readyRead() forever.

Task-number: QTBUG-18232
Reviewed-by: Markus Goetz

1 files changed, 7 insertions, 1 deletions

diff --git a/src/network/access/qhttpnetworkreply.cpp b/src/network/access/qhttpnetworkreply.cpp
index 704cf3a..cb6c09f 100644
--- a/src/network/access/qhttpnetworkreply.cpp
+++ b/src/network/access/qhttpnetworkreply.cpp
@@ -886,8 +886,14 @@ bool QHttpNetworkReplyPrivate::expectContent()
         return false;
     if (request.operation() == QHttpNetworkRequest::Head)
         return !shouldEmitSignals();
-    if (contentLength() == 0)
+    qint64 expectedContentLength = contentLength();
+    if (expectedContentLength == 0)
         return false;
+    if (expectedContentLength == -1 && bodyLength == 0) {
+        // The content-length header was stripped, but its value was 0.
+        // This would be the case for an explicitly zero-length compressed response.
+        return false;
+    }
     return true;
 }