Undertow Concepts

Internal

• Undertow
• XNIO Concepts

Overview

Undertow is a web server written in Java. It provides both blocking and non-blocking APIs based on NIO. It has a composition-based architecture that allows assembling a web server combining small single purpose handlers.

Undertow is embeddable, its lifecycle is controller by the embedding application.

Undertow is the default web server in WildFly.

Request Lifecycle

• http://undertow.io/undertow-docs/undertow-docs-1.3.0/index.html#request-lifecycle
• http://undertow.io/undertow-docs/undertow-docs-1.3.0/undertow-request-lifecycle.html

XNIO Concepts

• XNIO Worker
• XNIO Listener

HttpServerExchange

An exchange can be in blocking or non-blocking mode, and it can be put in blocking mode.