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-rw-r--r--logic/net/CacheDownload.cpp16
1 files changed, 11 insertions, 5 deletions
diff --git a/logic/net/CacheDownload.cpp b/logic/net/CacheDownload.cpp
index 8a8d00f0..0022c361 100644
--- a/logic/net/CacheDownload.cpp
+++ b/logic/net/CacheDownload.cpp
@@ -58,11 +58,17 @@ void CacheDownload::start()
}
QLOG_INFO() << "Downloading " << m_url.toString();
QNetworkRequest request(m_url);
- if (m_entry->remote_changed_timestamp.size())
- request.setRawHeader(QString("If-Modified-Since").toLatin1(),
- m_entry->remote_changed_timestamp.toLatin1());
- if (m_entry->etag.size())
- request.setRawHeader(QString("If-None-Match").toLatin1(), m_entry->etag.toLatin1());
+
+ // check file consistency first.
+ QFile current(m_target_path);
+ if(current.exists() && current.size() != 0)
+ {
+ if (m_entry->remote_changed_timestamp.size())
+ request.setRawHeader(QString("If-Modified-Since").toLatin1(),
+ m_entry->remote_changed_timestamp.toLatin1());
+ if (m_entry->etag.size())
+ request.setRawHeader(QString("If-None-Match").toLatin1(), m_entry->etag.toLatin1());
+ }
request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Cached)");