Return value of email confirmation 400, if a user clicks on the link a second time or more times

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By the way, here is the same question:

Return value of email confirmation 400, if a user clicks on the link a second time or more times

Hello guys, I have a question about email confirmation: It often happens that a user clicks several times on the confirmation link in the e-mail, e.g. Example: double click. The problem: If the user clicks on the link again (a second time) after successful confirmation (1st click), the user receives an error message in response, which the user could misunderstand. My question: How do I get a return value that the account has already been successfully confirmed? Thanks in advance! …