+++
title = "Concepts"
description = "Architecture, scaling mechanics, and routing model of the HTTP Add-on"
weight = 200
+++

Learn how the HTTP Add-on works before configuring it.

- **[Architecture](architecture/)** — The three components, how they interact, and the request flow.
- **[Routing](routing/)** — Host, path, and header matching with priority rules.
- **[Scaling](scaling/)** — Scaling metrics, scale-to-zero, and cold-start behavior.