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http blogger label link-error 400

when you click the label link of your blogspot with http, it will go to this page:

400. That’s an error.

Your client has issued a malformed or illegal request. That’s all we know.

while if you click it with https, it is ok.
but if you have a custom domain, how to do with it?

do not ask me why, I also want to know how, it is recommended to create label with no space, such as "howto" instead of "how to".