Http4s provides a frontend interface compatible with cats-effect, but it supports many different backend implementations
| Backend | Jdk Support | Http4s Version(s) | 100% Nonblocking | Http Client | Http Server | Websocket Client | Websocket Server | Proxy support (Client) |
|---|---|---|---|---|---|---|---|---|
| Blaze | 8+ | 0.15+ | ☑︎ Nonblocking | http4s-blaze-client |
http4s-blaze-server |
☒ | ☒ | ☒ |
| Async Http Client | 8+ | 0.18+ | ☑︎ Nonblocking | http4s-async-http-client |
☒ | ☒ | ☒ | ☑︎ |
| Ember | 8+ | 0.21+ | ☑︎ Nonblocking | http4s-ember-client |
http4s-ember-server |
? | ? | ☒ |
| Jdk11 Http Client | 11+ | 0.21+ | ☑︎ Nonblocking | http4s-jdk-http-client |
☒ | ☑︎ | ☒ | ☑︎ |
| Jetty | 8+ | All (0.2+) | ? | ☒ | http4s-jetty |
☑︎ | ||
| OkHttp | 8+ | 0.18+ | ☒ Blocking | http4s-okhttp-client |
☒ | ☒ | ☒ | ☑︎ |
Http4s has multiple smaller modules for Entity encoding and Decoding support of common types.
http4s-circe. See the [json] docs for more.http4s-scalatagshttp4s-scala-xml