What Is Twisted Web Server?


Heather Bennett

The Twisted Web Server is a powerful tool that allows developers to build and deploy web applications using Python. It is built on top of the Twisted networking framework and provides a flexible and scalable solution for handling web requests.

Features of the Twisted Web Server

The Twisted Web Server offers several key features that make it a popular choice among developers:

  • Asynchronous I/O: The server uses an event-driven architecture, allowing it to handle multiple requests simultaneously without blocking. This results in improved performance and scalability.
  • HTTP Protocol Support: The server supports various HTTP protocols, including HTTP/1.0, HTTP/1.1, and WebSocket.

    This allows developers to build both traditional websites and real-time applications.

  • Resource-based URL Routing: With the Twisted Web Server, you can easily map URLs to resources within your application. This makes it straightforward to create RESTful APIs or serve static files.
  • Template Rendering: The server includes support for various template engines, such as Jinja2 or Tornado. This makes it easy to generate dynamic HTML content based on data from your application.

Getting Started with the Twisted Web Server

To start using the Twisted Web Server, you first need to install the Twisted library using pip:

$ pip install twisted

Once installed, you can create a basic web server by following these steps:

  1. Create a new Python file (e.g., server.py) and import the necessary modules:

from twisted.internet import reactor
from twisted.web.server import Site
from twisted.resource import Resource
  1. Create a class that inherits from the Resource class and implements the necessary methods, such as render_GET() for handling GET requests:

class HelloWorld(Resource):
    def render_GET(self, request):
        return b"Hello, World!"
  1. Create an instance of the Site class, passing your resource to it:

root = HelloWorld()
site = Site(root)
  1. Start the server by calling the reactor’s listenTCP() method:

reactor.listenTCP(8080, site)

You can now run your Python script and access your web server at http://localhost:8080/. It will respond with the message “Hello, World!” for any GET request received.


The Twisted Web Server is a powerful tool for building and deploying web applications using Python. With its support for asynchronous I/O, HTTP protocols, URL routing, and template rendering, it provides a flexible and scalable solution. By following the steps outlined in this article, you can quickly get started with creating your own web server using Twisted.

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