FastAPI系列：查询字符串参数

单个查询字符串

@app.get('/index/{username}')
def index(username: str, id: int):  # id为查询字符串  ?id=5
    return {"message": "success", "username": username, "id": id}

可选的查询字符串参数

@app.get('/items/{item_id}')
async def read_item(item_id: str, q: Union[str, None] = None): # 也可以写成q: Optional[str] = None
    if q:
        return  {'item_id': item_id,  'q': q}
    return {'item_id': item_id}

多个查询字符串

# http://localhost:8000/items/?q=foo&q=bar
@app.get("/items/")
async def read_items(q: Union[List[str], None] = Query(default=None)):
    query_items = {"q": q}
    return query_items

具有默认值的查询参数列表 / 多个值

@app.get("/items/")
async def read_items(q: List[str] = Query(default=["foo", "bar"])):
    query_items = {"q": q}
    return query_items