Sync fastapi docs from 50fa3f7c on 2026-01-11

docs_src/handling_errors/tutorial005_py39.py

@@ -0,0 +1,25 @@
+from fastapi import FastAPI, Request
+from fastapi.encoders import jsonable_encoder
+from fastapi.exceptions import RequestValidationError
+from fastapi.responses import JSONResponse
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+@app.exception_handler(RequestValidationError)
+async def validation_exception_handler(request: Request, exc: RequestValidationError):
+    return JSONResponse(
+        status_code=422,
+        content=jsonable_encoder({"detail": exc.errors(), "body": exc.body}),
+    )
+
+
+class Item(BaseModel):
+    title: str
+    size: int
+
+
+@app.post("/items/")
+async def create_item(item: Item):
+    return item