HTTP Interceptor - sravanthimendu98/angular GitHub Wiki

What is HTTP Interceptor?

HTTP interceptors are a feature that allows you to intercept and modify HTTP requests and responses and perform operations such as

1. modifying request headers
2. handling errors
3. adding authentication tokens
4. caching responses, and more.

Uses of HTTP Interceptor:

Authentication: Interceptors can be used to automatically attach authentication tokens or credentials to outgoing requests, ensuring secure communication with the server.

Error Handling: Interceptors can centralize error handling logic

Caching: Interceptors can implement caching strategies by intercepting requests and responses, reducing redundant data fetching and improving application performance.

Logging: Interceptors can be used to log HTTP requests and responses for debugging or auditing purposes.

Features of HTTP Interceptor

Request Modification: Interceptors can modify outgoing HTTP requests before they are sent to the server. This includes adding headers, transforming request bodies, or even cancelling requests altogether.

Response Modification: Interceptors can also modify incoming HTTP responses before they reach the application code. This can involve transforming response data, handling errors, or adding custom logic based on the response.

Global Applicability: Interceptors are registered at the module level and are automatically applied to all HTTP requests and responses within the application, ensuring consistent behavior across different components and services.

Chaining: Multiple interceptors can be registered and chained together, allowing for modular and reusable code.

Dependency Injection: Interceptors can be injected with other services or dependencies, enabling more complex logic and integration with other parts of the application.