Can Flask Be Used as a Web Server?


Larry Thompson

Can Flask Be Used as a Web Server?

Flask is a popular Python web framework that allows developers to quickly build web applications. While it is commonly used for creating dynamic websites, you might be wondering if Flask can also serve as a web server. In this article, we will explore the capabilities of Flask and how it can be used as a web server.

The Basics of Flask

Before we dive into whether Flask can be used as a web server, let’s first understand what Flask is all about. Flask is a micro-framework that follows the Model-View-Controller (MVC) architectural pattern. It provides developers with the necessary tools to build web applications in Python.

With Flask, you can define routes, handle HTTP requests, render templates, and interact with databases. It is lightweight, flexible, and easy to learn, making it an excellent choice for both beginners and experienced developers.

Flask’s Built-in Development Server

One of the advantages of using Flask is its built-in development server. When you install Flask and run your application locally, it automatically starts a small HTTP server that serves your web application on your local machine.

This development server is not intended for production use but rather for testing and debugging purposes. It provides basic functionality such as request handling and template rendering but lacks the scalability and performance required in production environments.

The Limitations of the Development Server

While the built-in development server provided by Flask is convenient during development, it has certain limitations:

  • Single Threaded: The development server can only handle one request at a time. This means that if multiple simultaneous requests are made to your application, they will be processed sequentially.
  • Not Suitable for High Traffic: The development server is not designed to handle high traffic loads.

    It may struggle to serve multiple requests concurrently, resulting in slower response times.

  • Lacks Security Features: The development server does not provide the same level of security features as dedicated web servers. It is not recommended to expose your application directly to the internet using the development server.

Deploying Flask on a Production Web Server

To overcome the limitations of the development server, you should deploy your Flask application on a production web server. A production web server is specifically designed to handle high traffic loads, ensure scalability, and provide enhanced security features.

There are several popular production-ready web servers that can be used with Flask:

  • Nginx: Nginx is a powerful and lightweight web server that can act as a reverse proxy for your Flask application. It can handle multiple concurrent connections efficiently and offload static file serving.
  • Gunicorn: Gunicorn is a Python WSGI HTTP Server that can run any WSGI-compatible web application, including Flask.

    It is easy to configure and provides excellent performance.

  • uWSGI: uWSGI is another option for deploying Flask applications. It supports various protocols and offers advanced features like load balancing and process management.

In summary, while Flask’s built-in development server is suitable for testing and debugging purposes, it is not recommended for production use. To serve your Flask application in a production environment, you should deploy it on a dedicated web server like Nginx or Gunicorn.


Flask is a versatile web framework that can be used to build dynamic websites. However, it should not be used as a production web server due to the limitations of its built-in development server. By deploying your Flask application on a dedicated web server, you can ensure scalability, performance, and enhanced security.

So, next time you develop a Flask application, make sure to deploy it on a proper production web server for optimal performance and reliability.

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