What information is permissible to transmit through context in an application?

In Go, information related to request or operation lifecycle management is usually passed through the context (context.Context), for example:

• Canceling an operation (via the Done() channel).
• Deadlines and timeouts (via Deadline()).
• Values needed throughout the call chain, such as request identifiers, authentication tokens, metadata.

Important: Large objects, state, or data not related to request management should not be placed in the context to avoid violating its purpose and causing memory leaks.

Example of passing a value through the context:

ctx := context.WithValue(context.Background(), "requestID", "12345")
requestID := ctx.Value("requestID")