Hey :http4k: fans! We didn't ever really get arou...

# http4k

[dave]

Hey http4k fans!

We didn't ever really get around to telling you here about the new modules that we've recently introduced to http4k since the switch to Maven Central over the summer. A couple of highlights if you're upgrading from versions <= 6.15.1.0 to the newest shiny v6.18.1.0:

• New module: http4k-testing-powerassert - Power Assert is now bundled with Kotlin, so it’s the perfect assertions library to use
• New module: http4k-template-htmlflow - typesafe HTML builders in code
• New module: http4k-connect-amazon-route53 - Basic hosted zone and record set management
• http4k-web-datastar - D* was update to V1 recently and we've kept up with the quite reasonaly significant changes to the library since the betas were released.
• http4k-format-dataframe - New v1 version of the Kotlin DF library
• http4k-client-okhttp - Update to v5 of OkHttp - which takes advantages of java's Virtual threads and has support http4k-ai-mcp-sdk: We have consolidated all of the MCP modules into the http4k AI ecosystemfor GraalVM built in
• http4k-connect-amazon-cognito: Better support for various auth challenge modes
• http4k-core: Support for lenses and content negoriation, and accept-like headers
• Misc: Upgrades to Kotlin 2.2.20
• Misc: Fixed a gnarly bug with SPA routes to improve support for SPAs hosted at non-route paths
You can see the full changelog here: https://www.http4k.org/ecosystem/changelog/

Things on the radar:
• There is a new version of OpenAPI (3.2.0), which adds a fair amount of new features including SSE event schemas: https://spec.openapis.org/oas/v3.2.0.html
• Jackson v3 is on the horizon: https://github.com/FasterXML/jackson/wiki/Jackson-Release-3.0 so expect eventual changes to http4k-format-jackson, and maybe we'll get around to the rewrite of the http4k-api-openapi module

[Andrew O'Hara]

Does the new support for content negotiation supercede the AutoContentNegotiator class?

[dave]

not yet, nope. they are currently separate

[Cies Breijs]

Just learned about this; not so ugly HTML flow in Kotlin:
https://htmlflow.org/2024-05-21-Release-4.6.html

I use kotlinx.html, which looks very similar. I wonder how they both perform when using the DSL syntax, both runtime ááán compile time (i found this is where kotlinx.html is not doing so well).

[Cies Breijs]

power assert is indeed nice. i had already switched to it after learning it got bundled with kotlin.