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Full-Stack Integration

The seam between a React frontend and a FastAPI or Spring Boot backend — the part almost nobody teaches, and where a junior spends their first frustrated week. CORS and preflights, where the token lives, the API contract, retries and idempotency, uploads and long jobs, config across two deployables, and deploying both.

CORSAuth in the BrowserCalling Your APIAcross the BoundaryEnvironment & ConfigDeploying Both

18 Concepts

Beginner (0)

→Intermediate (8)

→Advanced (10)

Ask Aria on every concept

CORS

2 concepts

CORS — What Is Actually Happening

Configuring CORS Correctly

Auth in the Browser

4 concepts

Session Cookies, JWTs and OAuth

Where the Credential Lives — XSS and CSRF

Refresh Tokens, Expiry and Logout

Authorisation — Who Enforces What

Calling Your API

4 concepts

Designing the Contract

The Client Layer

Errors Across the Seam

Timeouts, Retries and Idempotency

Across the Boundary

3 concepts

File Upload, End to End

Pagination, Filtering and Sorting

Long-Running Operations

Environment & Config

2 concepts

Configuration Across Two Deployables

Running Both Locally

Deploying Both

3 concepts

Deploying a Frontend and a Backend

Domains, Cookies and TLS in Production

Debugging Across the Seam