Http4s 
Http4s is a minimal, idiomatic Scala interface for HTTP services. Http4s is
Scala's answer to Ruby's Rack, Python's WSGI, Haskell's WAI, and Java's
Servlets.
val http = HttpRoutes.of {
case GET -> Root / "hello" =>
Ok("Hello, better world.")
}
Learn more at http4s.org.
If you run into any difficulties please enable partial unification in your build.sbt
scalacOptions ++= Seq("-Ypartial-unification")
Code of Conduct
http4s is proud to be a Typelevel incubator
project. We are committed to providing a friendly, safe and welcoming
environment for all, and ask that the community adhere to the Scala
Code of Conduct.
License
This software is licensed under the Apache 2 license, quoted below.
Copyright 2013-2019 http4s [https://http4s.org]
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
Acknowledgments
Special thanks to YourKit for supporting this project's ongoing performance tuning efforts with licenses to their excellent product.