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Undertow is a Java web server based on non-blocking IO. It consists of a few different parts:

Programming language: Java

Undertow Recommendations

billoneil // StubbornJava
Undertow is an amazing web server. It's a fairly small codebase with very clean code. The building blocks of Undertow are HttpHandlers. They handle requests / responses / exception handling / logging and much more. They are build to be single purpose and composed together. The documentation is a bit lacking but if you just explore the code it's fairly easy to find what you need. The email list is also very active.

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Undertow Tags

Networking