Unfortunately, there's no simple .htaccess tweak that can automatically refresh that external image source. The heavens.php script would need modifying to add metadata headers allowing the image to cache for only a few seconds.
However, a workaround for self-refreshing the image would be to wrap it in some JavaScript. For example:
Code: Select all
<script>
setInterval(function() {
document.getElementById('img_sun').src = 'http://cheadlehulmeweather.co.uk/heavens.php?rand=' + Math.random();
}, 10000);
</script>
This would append a random query string to "trick" the image into refreshing every 10 seconds.
Not as seamless as having the PHP script handle expires headers but could save needing manual refreshes. Let me know if you give that a try or have any other questions!
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