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  1. Qt
  2. QTBUG-71896

QNetworkDiskCache does not handle 'no-cache' directive of Cache-Control in HTTP response header properly

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    • 9e61cec7915ca177e88bd685a3229f153ee7ab7a (qt/qtbase/5.12)

    Description

      Current implementation for 'no-cache' directive of Cache-Control in HTTP response header is incorrect. It should not be same with 'no-store'. There is condition to use cache.

      https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#Cacheability

      no-cache: {{}}Forces caches to submit the request to the origin server for validation before releasing a cached copy.

       

      Current codes in head are here:
      http://code.qt.io/cgit/qt/qtbase.git/tree/src/network/access/qnetworkreplyhttpimpl.cpp#n1741

      QNetworkCacheMetaData QNetworkReplyHttpImplPrivate::fetchCacheMetaData(const QNetworkCacheMetaData &oldMetaData) const
{
...
        // HTTP/1.1. Check the Cache-Control header
        if (cacheControl.contains("no-cache"))
            canDiskCache = false;
        else if (cacheControl.contains("no-store"))
            canDiskCache = false;

       

       

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            manordheim Mårten Nordheim
            akizawa Akihito Izawa
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