Introduction
Quickstart
About the docs
Concepts
Rationale HTTP Serverless WebSockets Server-Sent Events
Tutorials
Your first http4k app Deploying an http4k app to AWS Lambda Going native with Graal on AWS Lambda TDDing http4k
How-to guides
Overview Basic: Server as a function Basic: Client as a function Basic: Use a Server backend Basic: Different test-types Basic: Simple routing Basic: Nestable routes Attach context to a request Configure an OAuth Server Create a custom JSON marshaller Customise a Server backend Deploy WebJars Integrate with OpenAPI Leverage GraphQL Lookup a User Principal Monitor http4k Record & replay HTTP traffic Serve Server-Sent Events Serve Websockets Structure your logs with Events Test using Service Virtualisation Typesafe your API with lenses Secure and auth HTTP services Use a custom OAuth Provider Use a templating engine Use HTML forms Use Multipart forms Self document systems with tests Use Auto Content Negotiation Redoc and Swagger UI Make JSON Faster Make parallel HTTP calls
Reference
Overview Core Server backend Serverless backend HTTP & Websocket clients Typesafe contracts (OpenAPI3) JSON handling Templating Multipart forms Cloud Native Configuration Cloud Events Micrometer OpenTelemetry Resilience4J Failsafe AWS OAuth Digest GraphQL htmx Webhooks JSON RPC XML handling YAML handling Testing
Overview Approval Testing Chaos Testing Hamkrest Kotest Service Virtualisation Strikt Tracer Bullet WebDriver
Blog
Overview Meet http4k Typesafe Websockets Typesafe 12-factor config Documenting http4k apps with OpenApi3 Retrospective on v3 Nanoservices Toolbox: Guns for show, knives for a pro http4k v4 - 17 platforms and counting... http4k Platform v5 - New Servers, Loom, TracerBullet, OpenAI plugin SDK and more JCenter Shutdown
Changelog
http4k in action
Performance
FAQ
Getting support
Contribute/support http4k
Code of Conduct
Source Code

http4k blog¶

2021/2: Reassurance to http4k users regarding JCenter shutdown
- Regarding the JCenter shutdown.
2021/1: http4k v4: 17 platforms and counting...
- Announcement post for http4k v4.
2020/11: http4k Toolbox: Guns for show, knives for a pro
- Introduction to the http4k Toolbox website and CLI.
2020/10: Nanoservices: The Power of Composition
- You thought that microservices were a thing? Pah! The powerful abstractions in the http4k toolkit allow you to write entire useful apps which fit in a Tweet.
2020/09: A retrospective on http4k v3
- In preparation for the upcoming release of v4, the http4k team thought we'd do a bit of a retrospective about all the things that have gone in the >260 releases of v3.
2019/05: Documenting http4k APIs with OpenAPI3
- Overview of the OpenApi3 support available in the http4k library.
2018/11: Add typesafe 12-factor configuration to http4k apps with Environments
- Overview of how to configure http4k applications using the http4k-cloudnative module.
2018/02: TDDing http4k
- Step-by-step guide to TDDing a simple http4k application.
2017/12: Websockets. But typesafe. And testable. Without the Server
- Overview of typesafe Websocket support in http4k.
2017/11: Server as a Function. In Kotlin. Typesafe. Without the Server
- Overview of the Kotlin "Server as a Function" library, http4k.