Understanding routing in FastAPI

A route is defined to accept requests from an HTTP request method and optionally take parameters. When a request is sent to a route, the application checks whether the route is defined before processing the request in the route handler. On the other hand, a route handler is a function that processes the request sent to the server. An example of a route handler is a function that retrieves records from a database when a request is sent to a router via a route.

What are HTTP request methods?

HTTP methods are identifiers for indicating the type of action to be carried out. The standard methods include GET, POST, PUT, PATCH, and DELETE. You can learn more about HTTP methods at https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods.

Routing example

In the Project scaffolding section in the previous chapter, we built a single route application. The routing was handled by the FastAPI() instance initiated in the app variable:

from fastapi...