The following figure shows the interplay between the Pega Infinity server and the SDK content server:

The user session obtains static content from the SDK content server when the user initiates contact with a Pega embedded UI or portal application implemented with the SDK. This includes the ConstellationJS Engine and the SDK bridge and components. After loading the static content from the SDK content server, the web application communicates with the configured Infinity server through the following means:

• DX APIs for authentication
• SPA portal load
• REST API calls

The ConstellationJS Engine, loaded from the SDK content server, uses the public Constellation JS APIs to coordinate communication between the web application and the Infinity server.