Refreshing image ( and not displaying the one in the cache )

Hello , I made an app with many galleries stored locally but i made another section with a daily image, and this image is located on an ftp server http://XXXXX.com/image.png for example so everyday i upload the new one with the SAME name as the older one
( that is replaced by the newest ) , however the app is always displaying the older one , even if i restart the app , the computer or kill completely the app.
How could i do please?
Could i add something next to the image url (in a gallery module) to make it refresh everytime the app loads?
PS : if you couldn't solve this problem could i put a button to refresh the image?
Thanks
EDIT : I reinstalled my app and changed several times the image and now it's working?
Is it temporarily so this image will be cached and the issue will appear once more or was it a bug?

Hello
I don't believe you can without addressing/changing the way the image is loaded on your server.
You have several options to remove the caching even from files you upload.
You can for example use a .htaccess file in the folder where your image is uploaded
(assuming your webserver is an apache server)
<IfModule mod_expires.c>
# Enable expirations
ExpiresActive On
# Default directive
ExpiresDefault "access plus 1 day"
# Images
ExpiresByType image/gif "access plus 1 minute"
ExpiresByType image/png "access plus 1 minute"
ExpiresByType image/jpg "access plus 1 minute"
ExpiresByType image/jpeg "access plus 1 minute"
</IfModule>
You can also set the header using a loading script in php, asp or whatever language your server supports (e.g. showimage.php?img=blabla.png which allows you to set the no cache header (or limited cache header) in the php header before loading it in your
applications (works also for asp, etc.). Any searchengine will give you some inspirational examples.
Regards
StonyArc

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