Swiftpack.co - Package - IBM-Swift/Kitura-NIO


Swift 4.2 APIDoc Build Status - Master macOS Linux Apache 2 Slack Status


Kitura-NIO is a SwiftNIO based networking library for Kitura. Kitura-NIO adopts the same API as KituraNet, making the transition from KituraNet to Kitura-NIO seamless. While Kitura-NIO shares some code with Kitura-Net, the core comprising of HTTPServer, ClientRequest/ClientResponse and TLS support have been implemented using SwiftNIO. Kitura-NIO uses NIOOpenSSL for TLS support.

We expect most of our users to require higher level concepts such as routing, templates and middleware, these are not provided in Kitura-NIO, if you want to use those facilities you should be coding at the Kitura level, for this please see the Kitura project. Kitura-NIO, like Kitura-net, underpins Kitura which offers a higher abstraction level to users.

Kitura-NIO works with Swift 4.2. It is also being tested with the development binaries for Swift 5.


  • Port Listening
  • HTTP Server support (request and response)

Using Kitura-NIO

With Kitura 2.5 and future releases, to run on top of Kitura-NIO (instead of Kitura-Net) all you need to do is set an environment variable called KITURA_NIO before building your Kitura appilication:

    export KITURA_NIO=1 && swift build

If you have already built your Kitura application using Kitura-Net and want to switch to using KITURA_NIO, you need to update the package before building:

    export KITURA_NIO=1 && swift package update && swift build

Using the environment variable we make sure that only one out of Kitura-NIO and Kitura-Net is linked into the final binary.

Please note that though Kitura-NIO has its own GitHub repository, the package name is KituraNet. This is because the Kitura-NIO and Kitura-Net are expected to provide identical APIs, and it make sense if they share the package name too.

Getting Started

Visit www.kitura.io for reference documentation.

Contributing to Kitura-NIO

We'd be more than happy to receive bug reports, enhancement requests and pull requests!

  1. Clone this repository.

$ git clone https://github.com/IBM-Swift/Kitura-NIO && cd Kitura-NIO

  1. Build and run tests.

$ swift test

You may also want to run the tests in parallel: $ swift test --parallel

In some Linux environments, a low open file limit could cause test failures. See this.


We'd really love to hear feedback from you.

Join the Kitura on Swift Forums or our Slack to meet the team!


This library is licensed under Apache 2.0. Full license text is available in LICENSE.


Stars: 24
Help us keep the lights on


1.0.15 - Mar 20, 2019

What's new

  • A few performance improvements related to Swift 5(#166 and #156)
  • Corrections in the access levels of some properties/functions of ClientRequest(#167)
  • Fix for a major regression (#156)
  • Two important fixes for Kitura-CouchDB (#171 and #172)

1.0.12 - Jan 18, 2019

Minor performance improvements - #146 and #143

1.0.8 - Jan 3, 2019

In this release we drop the "vX.Y.Z" format for the release name and conform to other Kitura repos that adopt a "X.Y.Z" format.

What's new

  • A few performance improvements (#117, #118 and #120)
  • We now conform to the syntax rules enforced by swiftlint (#121, #122, #123, #124, #125)
  • Jazzy doc generation and Codecov support (#133 and #134)
  • The tests may be run with ephemeral ports which make swift test --parallel possible (#129 and #130)
  • A longstanding flaky test fixed (#131)

Thanks to @nethraravindran for her work on swiftlint, jazzy doc generation and codecov.

v1.0.7 - Dec 18, 2018

  • Swift 5 support (#116)
  • Performance improvement for calculating utf8-encoded content length (#114)

v1.0.6 - Nov 22, 2018

What's new

  • Fixes for two data races - HTTPServerRequest.keepAliveState (#99) and one in PipeliningTests (#105)
  • Skip storing an HTTPDummyServerDelegate in the HTTPServer.delegate property (#96)
  • Tests: move libressl installation to PackageBuilder (#97)
  • Performance enhancements: reimplementing HTTServerRequest.url (#112), better headers translation(#113) and IdleStateHandler removal (#104)
  • Other minor code readability enhancements