The browser thinks the content hasn't changed because the URL of the frame remains the same, so it serves a "frozen" cached version.
Web-based HMI (Human Machine Interface) panels that show live sensor data. viewerframe mode refresh
Mastering ViewerFrame Mode Refresh: Troubleshooting and Optimization The browser thinks the content hasn't changed because
Instead of: http://camera-ip/viewerframe.cgi The system can be coded to call: http://camera-ip/viewerframe.cgi?lastUpdate=12345 viewerframe mode refresh
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