Can Flask Be Used as Web Server?


Angela Bailey

Flask is a lightweight web framework that is widely used in Python web development. While it is primarily known for its ability to quickly build web applications, many people wonder if Flask can be used as a web server itself. In this article, we will explore whether Flask can indeed function as a standalone web server.

What is Flask?
Flask is a microframework for Python that allows developers to build web applications quickly and efficiently. It is designed to be simple and easy to use, making it a popular choice for beginners and experienced developers alike. Flask offers various features such as URL routing, template rendering, and request handling, making it suitable for developing small to medium-sized applications.

Web Server vs Web Framework
Before we delve into whether Flask can be used as a web server, let’s clarify the difference between a web server and a web framework. A web server is responsible for receiving HTTP requests from clients (such as browsers) and returning the appropriate responses. On the other hand, a web framework provides tools and libraries to simplify the process of building web applications.

While Flask includes its own development server that can be used during the development phase, it is not intended to serve production traffic. The built-in development server is convenient for testing purposes but lacks the scalability and robustness required for handling real-world traffic.

Using Flask with Web Servers
Although Flask itself cannot function as a standalone web server, it can be seamlessly integrated with popular production-ready servers such as Gunicorn or uWSGI. These servers are designed to handle high loads and provide advanced features like load balancing and process management.

By combining Flask with a production-grade server, you can leverage the simplicity of Flask’s development model while benefiting from the scalability and performance offered by dedicated servers. This setup allows you to deploy your Flask application in a production environment with confidence.

Step-by-Step: Using Gunicorn with Flask

  • Step 1: Install Gunicorn by running the following command in your terminal:
    pip install gunicorn
  • Step 2: Create a new file called `` and write your Flask application code in it.
  • Step 3: To start the Gunicorn server, use the following command:
    gunicorn app:app
    Here, `app` refers to the Flask application object defined in your `` file.

Using this setup, Gunicorn will act as the web server, while Flask will handle the application-specific logic. This separation of concerns allows each component to focus on its respective tasks, resulting in a more organized and scalable architecture.

The Benefits of Using a Dedicated Web Server

While Flask’s built-in development server is suitable for local testing and debugging, it lacks certain features required for production environments. Dedicated web servers offer several advantages:

  • Scalability: Production-ready servers like Gunicorn or uWSGI are designed to handle high volumes of traffic efficiently.
  • Performance: These servers are optimized for speed and can make use of multiple worker processes to handle concurrent requests.
  • Safety: Dedicated servers often include features like process isolation and request timeouts to ensure the stability and security of your application.
  • Maintenance: By using a widely-used server like Gunicorn or uWSGI, you can rely on an active community for support and updates.

In conclusion,

While Flask itself cannot be used as a standalone web server, it can be seamlessly integrated with production-grade servers like Gunicorn or uWSGI. This combination allows you to take advantage of Flask’s simplicity and productivity while ensuring scalability and performance in a production environment. By following the step-by-step instructions provided, you can easily set up your Flask application with a dedicated web server.

Remember, choosing the right web server for your Flask application is essential for ensuring its success in real-world scenarios. So, go ahead and explore the possibilities that Flask and dedicated servers have to offer!

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