Angular HttpClient Under The Hood. Design Patterns & Source Code Overview

Published: 24 September 2025
on channel: Decoded Frontend
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Have you ever wondered how Angular is designed internally? Which design patterns are used? And how does everything work under the hood? In this video, I'm going to dive into the source code of Angular, where you will see:

✔️ how the HttpClient is designed;
✔️ how HTTP interceptors are applied & which design patterns are used there;
✔️ how certain features, like withRequestsMadeViaParent(), work under the hood.

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⏰ Timestamps:
00:00:00 Intro;
00:00:51 High-Level Design Overview;
00:03:49 HttpClient Source Code Overview;
00:10:09 How Interceptors are used under the hood;
00:13:22 withRequestsMadeViaParent under the hood
00:15:46 Outro

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