Explain Key Features of Akka HTTP.

Reactive Programming:
- Built on Akka, it follows the principles of reactive streams and enables asynchronous, non-blocking communication.
Server-Side and Client-Side APIs:
- Server-Side: Easily build RESTful HTTP APIs or services.
- Client-Side: Interact with external HTTP-based services.
High Scalability and Performance:
- Uses actor-based concurrency from Akka, making it suitable for handling a high volume of requests efficiently.
Streaming Support:
- Fully supports streaming of large data (e.g., files or continuous data streams).
Modular Design:
- Provides flexible components that can be used independently, including routing, unmarshalling, marshalling, and connection handling.
Routing DSL:
- Includes a declarative routing DSL for defining API endpoints in a clear and concise way.
Integration with Akka Ecosystem:
- Seamlessly integrates with Akka actors, streams, and Akka Typed, enabling tight coupling with the rest of the Akka toolkit.
Lightweight:
- Unlike traditional HTTP frameworks, Akka HTTP doesn't impose a large framework structure and can be used as a library in applications.
Pluggable Components:
- Easily extendable with custom logic, such as custom directives, unmarshallers, and marshallers.