api-integration

Proxying Next.js API routes to FastAPI involves forwarding requests through /api/v1 endpoints while ensuring authentication cookies flow safely between the client, Next.js server, and backend. This pattern propagates Set-Cookie headers to maintain session integrity.

FastAPI loses authentication cookies from Next.js server actions when cookie forwarding is not explicitly implemented across server boundaries. Proper cookie handling requires forwarding cookies from the incoming Next.js request to the downstream FastAPI proxy route.

Hiding FastAPI backend URLs from the Next.js client is achieved by proxying API requests through Next.js /api/* routes. This pattern exposes only the Next.js server endpoints to the client while internally routing traffic to the FastAPI backend.

SWR integrates with typed API clients by using stable data fetching patterns that return typed results. This works alongside Next.js server actions for SSR data fetching, ensuring consistent typing across both client and server API boundaries.

Proxying Next.js to FastAPI fully supports Set-Cookie propagation for server-side rendering by intercepting backend responses. It extracts Set-Cookie headers and applies them to the client-facing response, preserving session state during SSR data fetching.

Typed client and server APIs for Next.js and FastAPI proxy routes are implemented by defining shared types for requests and responses. This enforces consistent error handling and typing across client-side fetching and server actions without exposing backend URLs.