What Is Scala Web Server?


Angela Bailey

What Is Scala Web Server?

Scala is a versatile programming language that combines the best features of object-oriented and functional programming. With its strong static typing and concise syntax, Scala has gained popularity among developers for building robust and scalable applications.

One area where Scala truly shines is web development, thanks to its powerful ecosystem of web frameworks and libraries. In this article, we will explore one of the key components of building web applications in Scala – the Scala Web Server.

The Importance of a Web Server

A web server plays a crucial role in serving web pages and processing incoming requests from clients. It acts as an intermediary between the client’s browser and the backend application, handling tasks such as routing requests, processing data, and generating dynamic content.

In Scala, there are several web servers available that provide different features and performance characteristics. Choosing the right web server for your project depends on factors such as scalability requirements, ease of use, and community support.

Scala Web Server Options

Let’s take a look at some popular Scala web servers:

  • Play Framework: Play is a full-featured MVC framework built on top of Akka Streams. It offers excellent performance and productivity with built-in support for asynchronous programming.
  • Akka HTTP: Akka HTTP is a lightweight yet powerful toolkit for building scalable server-side applications.

    It leverages Akka actors to provide high-performance request handling.

  • Finagle: Finagle is a highly extensible RPC framework developed by Twitter. It provides a flexible set of tools for building robust and fault-tolerant servers using functional programming principles.

Diving Deeper into Play Framework

Play Framework deserves special attention due to its popularity and extensive features. It adopts a convention-over-configuration approach, which allows developers to focus on writing business logic rather than boilerplate code.

Some key features of Play Framework include:

  • Routing: Play uses a powerful routing DSL that enables defining routes in a concise and expressive manner. Routes can be defined using HTTP methods, URL patterns, and placeholders for dynamic segments.
  • Controllers: Controllers in Play are responsible for handling incoming requests and generating responses.

    They can be written using both synchronous and asynchronous programming styles, depending on the requirements.

  • Templating: Play provides a powerful templating engine that allows developers to generate dynamic HTML content using Scala’s familiar syntax. Templating includes features like conditionals, loops, and variable substitution.
  • Data Access: Play integrates seamlessly with popular database libraries such as Slick and Ebean, enabling efficient data access and manipulation.

Akka HTTP – Lightweight and Performant

If you’re looking for a lightweight web server with excellent performance characteristics, Akka HTTP is worth considering. It leverages the actor-based model of Akka to provide highly scalable request handling.

A few notable features of Akka HTTP include:

  • Routing DSL: Akka HTTP offers a concise routing DSL similar to Play Framework, making it easy to define RESTful APIs and handle complex request patterns.
  • Streaming Support: Akka Streams integration allows handling large amounts of data efficiently by leveraging asynchronous streaming techniques.
  • HTTP/2 Support: Akka HTTP provides built-in support for the HTTP/2 protocol, allowing for faster and more efficient communication between clients and servers.


In conclusion, Scala Web Server is a crucial component in building robust and scalable web applications using the Scala programming language. With options like Play Framework, Akka HTTP, and Finagle, developers have a wide range of choices to suit their specific requirements.

Whether you prefer the convention-over-configuration approach of Play or the lightweight performance of Akka HTTP, Scala’s web servers empower developers to create high-quality applications with ease.

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