Choosing a Web Listener

You can choose any one of the three Web listeners

Oracle REST Data Services,
Oracle HTTP Server, and
Embedded PL/SQL gateway.

Oracle Application Express uses a simple architecture where pages are dynamically generated using metadata stored within the Oracle Database. There is no code generation or file based compilation. Once fully installed, a Uniform Resource Locator (URL) is defined for both developers and end users to access Oracle Application Express. Users require only a Web browser and the required URL and no additional client software is required.

The Web listener functions as a communications broker between the Web browser and the Oracle Application Express objects in the Oracle database by mapping browser requests into database stored procedure calls. You have a choice of three Web listeners.

Oracle REST Data Services (formerly Oracle Application Express Listener).
Oracle HTTP Server.
Embedded PL/SQL gateway.

Database Performance Techniques