golang-context

Propagate cancellation signals and deadlines across Go HTTP handlers and database calls by passing a single context.Context through service layers. Use r.Context() in HTTP handlers and context-aware APIs like QueryContext to ensure end-to-end cancellation.

Avoid storing context.Context in a Go struct because contexts are designed for request-scoped flow, not long-lived storage. Passing contexts explicitly through function arguments ensures cancellation signals and deadlines propagate cleanly without leaking resources.

Handle HTTP client timeouts and disconnects in a Go service by propagating context.Context from the incoming request using r.Context(). This ensures downstream operations, including database queries and outgoing HTTP calls, abort immediately when the client disconnects or the deadline expires.

Pass request-scoped values through a Go service using context.WithValue with unexported keys. This prevents external packages from accessing or overwriting your internal context values, maintaining type safety and clean request-scoped data propagation.

Use context for database queries in Go by calling context-aware variants like QueryContext and ExecContext. Passing the request context ensures database operations respect timeouts and cancel cleanly on client disconnects, preventing leaked resources.

Go context.Context works seamlessly with HTTP servers and downstream service calls. By propagating a single context from r.Context() through HTTP clients, service layers, and database calls, you maintain consistent request-scoped data and clean shutdowns end-to-end.