Why it matters

http4s is FP Scala HTTP standard. Understanding shapes web dev.

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The architecture

HttpRoutes[F]: function Request → Option[Response].

Server backends: Blaze, Ember, Netty.

http4s architectureHttpRoutesreq → resp functionServer backendBlaze / EmberClient APIsame designSame abstractions for client + server; fully typed
http4s components.
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How it works end to end

Type-safe routing: match on request patterns.

Middleware: composable, transform routes.

Encoders/decoders: JSON via Circe.

Client: functional API for calling other services.