What Is ASGI Web Server?


Larry Thompson

What Is ASGI Web Server?

In the world of web development, there are various technologies and protocols that play a crucial role in delivering dynamic and interactive web applications. One such technology is ASGI (Asynchronous Server Gateway Interface), which has gained popularity in recent years. In this article, we will explore what ASGI web servers are and why they are important.

Understanding ASGI

ASGI stands for Asynchronous Server Gateway Interface. It is a standard interface between web servers and Python web applications or frameworks, allowing them to communicate with each other effectively. Unlike traditional synchronous web servers that handle one request at a time, ASGI servers have the ability to handle multiple requests concurrently.

ASGI servers leverage asynchronous programming techniques to achieve high performance and scalability. By using non-blocking I/O operations and event-driven architecture, they can efficiently handle a large number of concurrent connections without blocking the execution of other requests.

The Benefits of ASGI Web Servers

There are several benefits to using ASGI web servers:

  • Scalability: ASGI servers can handle a large number of concurrent connections, making them highly scalable for applications with heavy traffic.
  • Performance: By utilizing asynchronous programming techniques, ASGI servers can perform tasks concurrently, resulting in improved performance compared to traditional synchronous servers.
  • Real-time capabilities: ASGI is well-suited for real-time applications such as chat systems or collaborative editing tools that require instant updates.
  • Ecosystem support: ASGI has gained significant support within the Python ecosystem. Many popular Python frameworks and libraries have adopted the ASGI standard, allowing developers to easily build asynchronous web applications.

ASGI Web Servers in Practice

To run a Python web application using ASGI, you need an ASGI server. There are several popular ASGI servers available, including:

  • uvicorn: A lightning-fast ASGI server built on top of uvloop and httptools.
  • daphne: An HTTP and WebSocket server that supports ASGI 3.0 specification.
  • hypercorn: A fully-featured ASGI server based on the trio and h11 libraries.

To use any of these servers, you simply need to install them using pip and run your application with the appropriate command-line arguments. The server will then handle incoming requests, communicate with your application via the ASGI interface, and send back responses to clients.


ASGI web servers provide an efficient way to build high-performance and scalable Python web applications. By leveraging asynchronous programming techniques, they can handle a large number of concurrent connections without sacrificing performance. With the growing support within the Python ecosystem, ASGI is becoming increasingly popular among developers.

If you’re looking to build modern web applications that require real-time capabilities or need to handle heavy traffic, considering an ASGI server for your Python project can be a wise choice.

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