FastAPI: POST の引数の処理

FastAPI で POST の引数の受け取り方です。

サーバープログラム

post01.py

from fastapi import FastAPI
from pydantic import BaseModel

class Item(BaseModel):
	aa: float
	bb: float

app = FastAPI()

@app.post("/sum/")
async def create_item(item: Item):
	rvalue = {}
	rvalue["wa"] = item.aa + item.bb
	return rvalue


@app.post("/diff/")
async def create_item(item: Item):
	rvalue = {}
	rvalue["sa"] = item.aa - item.bb
	return rvalue

サーバーの起動

uvicorn post01:app --reload

クライアントからアクセス

$ http POST http://127.0.0.1:8000/sum/ aa=12.1 bb=34.5
HTTP/1.1 200 OK
content-length: 11
content-type: application/json
date: Sat, 05 Jun 2021 04:49:11 GMT
server: uvicorn

{
    "wa": 46.6
}

$ http POST http://127.0.0.1:8000/diff/ aa=12.1 bb=34.5
HTTP/1.1 200 OK
content-length: 12
content-type: application/json
date: Sat, 05 Jun 2021 04:49:37 GMT
server: uvicorn

{
    "sa": -22.4
}

確認したバージョン

$ python
Python 3.12.7 (main, Feb  4 2025, 14:46:03) [GCC 14.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import fastapi
>>> fastapi.__version__
'0.110.3'