由于重复的标题可能会导致各种网络出现问题 - 服务器和API（无论规范如何），我怀疑是否有任何通用用例，这是***实践。当然，这并不是说有人在某个地方没有这样做。

Since duplicate headers can cause issues with various web-servers and APIs (regardless of what the spec says), I doubt there is any general purpose use case where this is best practice. That's not to say someone somewhere isn't doing it, of course.