[Solved] Why is it important that Angular HTTP interceptors return an Observable instead of a Promise? - Ans: Because Angular HTTPClient uses Observables for request streams and cancellation | Angular

Angular - HTTP Client

Why is it important that Angular HTTP interceptors return an Observable instead of a Promise?

ABecause Angular HTTPClient uses Observables for request streams and cancellation

BBecause Promises are not supported in Angular

CBecause Observables automatically retry failed requests

DBecause Promises cannot carry headers

Step-by-Step Solution

Solution:

Step 1: Recall Angular HTTPClient design
Angular HTTPClient uses Observables to support streams, multiple events, and cancellation.
Step 2: Understand why Observables are required in interceptors
Interceptors must return Observable to integrate with HTTPClient's reactive flow.
Final Answer:
Because Angular HTTPClient uses Observables for request streams and cancellation -> Option A
Quick Check:
HTTPClient uses Observables, not Promises [OK]

Quick Trick: Angular HTTPClient is built on Observables, not Promises [OK]

Common Mistakes:

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Why is it important that Angular HTTP interceptors return an Observable instead of a Promise?