Headers for PNG image output to make sure it gets cached at browser?
The final thing that worked was:
header('Pragma: public');header('Cache-Control: max-age=86400');header('Expires: '. gmdate('D, d M Y H:i:s \G\M\T', time() + 86400));header('Content-Type: image/png');Now the browser does not make requests for the image when loading a page with embeded one.
Make sure you also add public as so:
header('Cache-Control: max-age=86400, public');Read this also, is very helpful.
An Expires header should help.
header('Expires: '. gmdate('D, d M Y H:i:s \G\M\T', time() + 86400));