Angular Interceptor: Two implementation methods and application scenarios

This article introduces Angular interceptors, including class-based interceptors (using with InterceptorsFromDi) and function-based interceptors (using with Interceptors), and explains its applications in modifying requests, handling responses, global error handling, and request logging.

Core functions:

• Add authorization token: Add an authorization token for the security API.
• Modify request or response: Add header information and convert data.
• Automatically handle errors: An error message is displayed when the request fails.
• Request logging: Tracks all HTTP requests for easy debugging.

Interceptor type comparison:

• Function-based interceptor: Concise and lightweight.
• Class-based interceptor: is more powerful and easier to scale.

Which interceptor to choose depends on the complexity and requirements of the project. For simple scenarios, function-based interceptors are sufficient; for more complex scenarios, class-based interceptors are more flexible and maintainable.