Creating a fastapi server for ADK multiagents

[tahreemrasul]

I need to use the agents I built in ADK with a custom web interface, so I wanted to write a simple FastAPI app with some endpoint that gets some input, processes it using the agent and returns the output from the agent, which I can then display in my own webapp. I want to understand how I can do this. I did find this helper function from google.adk.cli.fast_api import get_fast_api_app, but I dont understand how to give it a custom endpoint.