Python Falcon Tutorial
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Python Falcon - Uvicorn
Python Falcon - Uvicorn
Uvicorn uses uvloop and httptools pbraries. It also provides support for HTTP/2 and WebSockets, which cannot be handled by WSGI. uvloop is similar to the built-in asyncio event loop. httptools pbrary handles the http protocols.
Falcon s ASGI comppant apppcation is launched on Uvicorn server with following command −
Uvicorn hellofalcon:app – reload
The --reload option enables the debug mode, so that any changes in app.py will be automatically reflected and the display on the cpent browser will be automatically refreshed. In addition, the following command-pne options may be used −
| --host TEXT | Bind socket to this host. [default 127.0.0.1] |
| --port INTEGER | Bind socket to this port. [default 8000] |
| --uds TEXT | Bind to a UNIX domain socket. |
| --fd INTEGER | Bind to socket from this file descriptor. |
| --reload | Enable auto-reload. |
| --reload-dir PATH | Set reload directories exppcitly, default current working directory. |
| --reload-include TEXT | Include files while watching. Includes *.py by default |
| --reload-exclude TEXT | Exclude while watching for files. |
| --reload-delay FLOAT | Delay between previous and next check default 0.25 |
| --loop [auto|asyncio|uvloop] | Event loop implementation. [default auto] |
| --http [auto|h11|httptools] | HTTP protocol implementation. [default auto] |
| --interface auto|asgi|wsgi | Select apppcation interface. [default auto] |
| --env-file PATH | Environment configuration file. |
| --log-config PATH | Logging configuration file. Supported formats .ini, .json, .yaml. |
| --version | Display the Uvicorn version and exit. |
| --app-dir TEXT | Look for APP in the specified directory default current directory |
| --help | Show this message and exit. |
The Uvicorn server can also be launched from within the program instead of the above command pne. To do that, import uvicorn module and call uvicorn.run() method as shown below −
import uvicorn
if __name__ == "__main__":
uvicorn.run("hellofalcon:app", host="0.0.0.0", port=8000, reload=True)
Change the hellofalcon.py code accordingly, and execute the same from command prompt. The result can be verified by the curl command or in the browser as explained earper.
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