APEX Websocket Notification
Notifying clients from backend servers in stateless environments like web applications with HTTP protocol is a challenge, here a great bundle where you can achieve this goal in APEX applications.
PDF Viewer in APEX
For a long time I was struggling with having to use a JS library ( https://bashooka.com/coding/10-javascript-libraries-and-tools-to-work-with-pdf/ ) to view pdfs or images from the database, but with no luck because my files are stored in the database as BLOBs, it may seem simple for someone, but was not obvious for me to have a URL for my BLOBs to server the JS libraries. The following post will show how this is done. Preview PDF Uploads in an APEX App (Cross-post)
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