PART IV · BACKEND

Backend

Understand what happens after a request reaches the server.

01

Module goals

Follow a request from its route into backend code, through validation and business logic, to data and a response.

Request→Route→Function→Business Logic→Database→Response

02

Backend layers

ServerWhere backend software runs.PythonA language for backend code.FrameworkStructure and tools for an application.RouteMaps a request to code.ServiceCoordinates a business capability.Repository / DAOReads and writes stored data.

03

Explore Module 04

FastAPI Function Parameter Validation Business Logic Dependency Package Environment Variable Configuration Exception Error Handling Logging External API Middleware Background Job

04

Glossary

Use the Module 04 glossary for concise English and Chinese definitions.

Open Backend Glossary →