The short story is, everything is okay,
its my bad to taken the test function out of context,
sorry about that of issue report.

# just for details review (related file attached):
#
# check line 1277 to line 1278 (main branch of Python currently):
# https://github.com/python/cpython/blob/17b16e1/Lib/http/server.py#L1277-L1278
#
# thus, `functools.partial` (closure/wrapper) will
# make the parameter `protocol` of the function `test` useless.
# So, specify a handler class directly.