Omar Sawalhah

Creating APEX components on top of web source modules will open the horizon to build your front end or admin dashboards using APEX and having any backend database with web services. Read-Write APEX application fully based on alien data

Running a long process from APEX application will force the browser to hang and the web server to send a timeout error. Here how you can run such a process. Run PL/SQL in the background and display a progress bar

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. APEX Websocket Notification Bundle

For production installation, you surely need to have a layer in front (Reverse Proxy) of your ORDS, here are samples of configuration for the most popular web servers 1. Apache      Reverse Proxy Configuration using Apache 2. NGINX     The Oracle APEX Reverse Proxy Guide using NGINX

I found this resource as a great reference for Oracle development in general and APEX specifically. Oracle Database & APEX development, advice and support