I want to secure my site by using https instead of http. Now I get the following message:
jquery.min.js:4 Mixed Content: The page at 'https://www.tennisparkbrederode.nl/' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://www.tennisparkbrederode.nl/index.php?option=com_imagerecycle&task=image.startOptimizeAll&mode=auto'. This request has been blocked; the content must be served over HTTPS.
How can I prevent such a message?