التبعيات وتركيب التطبيق

from typing import Annotated
from fastapi import Depends, FastAPI, Header, HTTPException
from fastapi.testclient import TestClient
def locale(x_lab_locale: Annotated[str, Header()] = "en"):
    if x_lab_locale not in {"en", "ar"}:
        raise HTTPException(status_code=400, detail="Unsupported locale")
    return x_lab_locale
app = FastAPI()
@app.get("/greeting")
def greeting(value: Annotated[str, Depends(locale)]): return {"locale": value}
with TestClient(app) as client:
    print(client.get("/greeting", headers={"X-Lab-Locale": "ar"}).json())
    print(client.get("/greeting", headers={"X-Lab-Locale": "xx"}).status_code)

{'locale': 'ar'}
400

تسلم التبعية اللغة أوتوقف 400، وليست الترويسة اعتماد هوية.

from typing import Annotated
from fastapi import Depends, FastAPI
from fastapi.testclient import TestClient
calls = {"count": 0}
def value():
    calls["count"] += 1
    return calls["count"]
app = FastAPI()
@app.get("/pair")
def pair(a: Annotated[int, Depends(value)], b: Annotated[int, Depends(value)]):
    return [a, b]
with TestClient(app) as client:
    print(client.get("/pair").json())
    print(client.get("/pair").json())

[1, 1]
[2, 2]

يقيم كل طلب مرة لمستهلكين، والعداد للعرض لا حالة طلب إنتاج.