Architecture Overview

Architecture Overview

High-level architecture of Apache Traffic Server for new contributors.

Overview

Event-Driven Model

Continuations

Event Loop

Threading Model

Event Threads

DNS Threads

Disk I/O Threads

HTTP State Machine

Request Processing Flow

Plugin Hooks

Plugin System

Hook Points

Plugin API

Key Source Files

Repository Structure

See Also

• HTTP 3 Documentation — HTTP/3 and QUIC architecture
• Getting Started — Building and running ATS