FastAPI例外ハンドラ：レスポンスカスタマイズ

@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request, exc):
    return PlainTextResponse(str(exc), status_code=400)

[
    {
        'type': 'int_parsing',
        'loc': ('path', 'item_id'),
        'msg': 'Input should be a valid integer, unable to parse string as an integer',
        'input': 'abc'
    }
]

from fastapi.exception_handlers import request_validation_exception_handler

@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request, exc):
    print(f"OMG! The client sent invalid data!: {exc}")
    return await request_validation_exception_handler(request, exc)

{
    "detail": [
        {
            "type": "int_parsing",
            "loc": ["path", "item_id"],
            "msg": "Input should be a valid integer, unable to parse string as an integer",
            "input": "abc"
        }
    ]
}