Python Flask Limiter：如何在自定义key_func中获取URL参数？

Question

我要编写自定义key_func。

如果URL像：http://www.example.com/aaa/?bbb=xxx，并且我想使用bbb的值作为键。我可以这样写：

structure(list(date = structure(c(-15890, -15890, -15890, -15890, 
-15859, -15859, -15859, -15859, -15828, -15828, -15828, -15828, 
-15798, -15798, -15798, -15798), class = "Date"), type = c("Small; Low", 
"Small; 2", "Small; 3", "Small; 4", "Small; Low", "Small; 2", 
"Small; 3", "Small; 4", "Small; Low", "Small; 2", "Small; 3", 
"Small; 4", "Small; Low", "Small; 2", "Small; 3", "Small; 4"), 
    y = c(3.78, -0.41, -1.94, 0.35, -2.21, -8.73, 2.44, 0.61, 
    -6.21, -0.3, -6.2, -1.64, -8.62, -3.75, -5.67, 5.72), x1 = c(1.28446741361197, 
    1.07356662903464, 1.04832788500252, 0.943639719875559, 1.28446741361197, 
    1.07356662903464, 1.04832788500252, 0.943639719875559, 1.28446741361197, 
    1.07356662903464, 1.04832788500252, 0.943639719875559, 1.28446741361197, 
    1.07356662903464, 1.04832788500252, 0.943639719875559), x2 = c(1.44263144125512, 
    1.52425318619375, 1.24887757539023, 1.20367883758503, 1.44263144125512, 
    1.52425318619375, 1.24887757539023, 1.20367883758503, 1.44263144125512, 
    1.52425318619375, 1.24887757539023, 1.20367883758503, 1.44263144125512, 
    1.52425318619375, 1.24887757539023, 1.20367883758503), x3 = c(0.430576566887732, 
    0.237649845254604, 0.520660917641051, 0.588602620999144, 
    0.430576566887732, 0.237649845254604, 0.520660917641051, 
    0.588602620999144, 0.430576566887732, 0.237649845254604, 
    0.520660917641051, 0.588602620999144, 0.430576566887732, 
    0.237649845254604, 0.520660917641051, 0.588602620999144)), row.names = c(NA, 
-16L), class = c("tbl_df", "tbl", "data.frame"))

如果URL类似于http://www.example.com/aaa/<bbb>，而我仍想使用bbb的值作为键怎么办？

路由功能将是：

def my_key_func():
    return request.args.get('bbb')

如何将bbb传递给my_key_func？