Perfection is finally attained not when there is no longer anything to add, but when there is no longer anything to take away.
- Antoine de Saint-Exupéry
Falcon is a reliable, high-performance Python web framework for building large-scale app backends and microservices. It encourages the REST architectural style, and tries to do as little as possible while remaining highly effective.
Falcon apps work with any WSGI server, and run like a champ under CPython 3.5+ and PyPy 3.5+.
Falcon tries to do as little as possible while remaining highly effective.
No reliance on magic globals for routing and state management
Stable interfaces with an emphasis on backwards-compatibility
Simple API modeling through centralized RESTful routing
Highly-optimized, extensible code base
Easy access to headers and bodies through request and response objects
DRY request processing via middleware components and hooks
Strict adherence to RFCs
Idiomatic HTTP error responses
Straightforward exception handling
Snappy testing with WSGI/ASGI helpers and mocks
CPython 3.5+ and PyPy 3.5+ support
How is Falcon different?¶
We designed Falcon to support the demanding needs of large-scale microservices and responsive app backends. Falcon complements more general Python web frameworks by providing bare-metal performance, reliability, and flexibility wherever you need it.
Fast. Same hardware, more requests. Falcon turns around requests several times faster than most other Python frameworks. For an extra speed boost, Falcon compiles itself with Cython when available, and also works well with PyPy. Considering a move to another programming language? Benchmark with Falcon + PyPy first.
Reliable. We go to great lengths to avoid introducing breaking changes, and when we do they are fully documented and only introduced (in the spirit of SemVer) with a major version increment. The code is rigorously tested with numerous inputs and we require 100% coverage at all times. Falcon does not depend on any external Python packages.
Debuggable. Falcon eschews magic. It’s easy to tell which inputs lead to which outputs. To avoid incentivizing the use of hard-to-debug global state, Falcon does not use decorators to define routes. Unhandled exceptions are never encapsulated or masked. Potentially surprising behaviors, such as automatic request body parsing, are well-documented and disabled by default. Finally, we take care to keep logic paths within the framework simple, shallow and understandable. All of this makes it easier to reason about the code and to debug edge cases in large-scale deployments.
Flexible. Falcon leaves a lot of decisions and implementation details to you, the API developer. This gives you a lot of freedom to customize and tune your implementation. Due to Falcon’s minimalist design, Python community members are free to independently innovate on Falcon add-ons and complementary packages.
About Apache 2.0¶
Falcon is released under the terms of the Apache 2.0 License. This means that you can use it in your commercial applications without having to also open-source your own code. It also means that if someone happens to contribute code that is associated with a patent, you are granted a free license to use said patent. That’s a pretty sweet deal.
Now, if you do make changes to Falcon itself, please consider contributing your awesome work back to the community.
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