Description: HTTP response interceptors in Angular are services that allow intercepting and manipulating the responses of HTTP requests before they reach the components that requested them. These interceptors are part of Angular’s HttpClient module and are used to perform tasks such as error handling, modifying response data, adding headers, or implementing authentication logic. By implementing an interceptor, developers can centralize logic related to HTTP responses, improving code maintainability and readability. Interceptors are configured in the main application module and execute in the order they are provided, allowing granular control over data flow. This feature is especially useful in web applications that require consistent handling of responses, such as managing authentication tokens or transforming data before it is used by user interface components. In summary, HTTP response interceptors are a powerful tool in Angular that enables developers to efficiently manage server interactions and enhance user experience.
Uses: HTTP response interceptors are primarily used to centrally handle errors, modify response data before it is processed by components, and add headers or additional information to responses. They are also useful for implementing authentication logic, such as adding access tokens to requests. This allows the application to maintain a consistent data flow and reduce code duplication across different components that make HTTP requests.
Examples: A practical example of an HTTP response interceptor in Angular could be a service that checks if the server response contains a specific error code and, if so, redirects the user to an error page. Another example would be an interceptor that transforms the response data from an API to fit the structure expected by the application components, such as converting dates into a readable format.
