Undertow is a flexible performant web server written in java,
providing both blocking and non-blocking API’s based on NIO.
Undertow has a composition based architecture that allows you to build a web server by combining small single purpose handlers.
The gives you the flexibility to choose between a full Java EE servlet 3.1 container, or a low level non-blocking handler, to anything in between.
Undertow is extremely lightweight, with the Undertow core jar coming in at under 1Mb.
It is lightweight at runtime too, with a simple embedded server using less than 4Mb of heap space.
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