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.

It has support for Servlet 3.1.

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.