4. Server API

Apache Pekko HTTP also provides an embedded, Reactive-Streams-based, fully asynchronous HTTP/1.1 server implemented on top of Streams.

It supports the following features:

• Full support for HTTP persistent connections
• Full support for asynchronous HTTP streaming including “chunked” transfer encoding accessible through an idiomatic API
• WebSocket support
• Optional SSL/TLS encryption
• Optional support for HTTP pipelining

The server-side components of Apache Pekko HTTP are split into two layers:

High-level Server-Side API

Higher-level functionality in the pekko-http module which offers a very flexible “Routing DSL” for elegantly defining RESTful web services as well as functionality of typical web servers or frameworks, like deconstruction of URIs, content negotiation or static content serving.

Core Server API

The basic low-level server implementation in the pekko-http-core module.

Depending on your needs you can either use the low-level API directly or rely on the high-level Routing DSL which can make the definition of more complex service logic much easier. You can also interact with different API levels at the same time and, independently of which API level you choose Apache Pekko HTTP will happily serve many thousand concurrent connections to a single or many clients.