Tornado combines a web framework with an HTTP server and asynchronous networking library. Its event-driven design is suited to applications that keep many connections open at once, particularly real-time messaging, streaming services and long-polling endpoints.
A typical application registers request-handler classes with a routing object and uses the built-in server to accept connections. Tornado can also be used for lower-level network clients and services without building an entire website. Its integration with standard asynchronous programming facilities allows applications to combine HTTP handling with other non-blocking operations.
Tornado is particularly appropriate where a request cannot be processed as a short, blocking operation. Its HTTP and networking facilities can coexist in one process, but developers must be conscious of blocking libraries and move expensive operations off the event loop when necessary.
This is free and open source software.
Key Features
- Non-blocking HTTP server handles large numbers of concurrently open connections.
- RequestHandler classes implement HTTP endpoints and response processing.
- WebSocket handlers provide bidirectional communication with connected clients.
- Asynchronous HTTP client sends requests without blocking the event loop.
- Routing facilities map paths and hosts to their handlers.
- Flexible template engine renders pages with escaping and template inheritance.
- Secure-cookie helpers, authentication support and CSRF protection.
- IOLoop, IOStream and TCP utilities for non-HTTP network applications.
- Integration with asyncio lets developers use compatible asynchronous libraries.
- Testing helpers support asynchronous test cases and HTTP clients.
- Process utilities allow server processes to be run across multiple CPU cores.
- Asynchronous stream utilities implement TCP-based client and server communication.
- Configurable logging records server and application events for diagnosis.
- HTTP request parsing and cookies support ordinary web application requirements.
Website: www.tornadoweb.org/en/stable/
Support:
Developer: The Tornado Authors
License: Apache License 2.0
Tornado is written in Python. Learn Python with our recommended free books and free tutorials.
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