The request you are trying to do again is the POST request, so a warning. You can either make sure that you only reload the resources received through GET requests, or, alternatively, send a hidden <form> using the POST method (and thus simulate a reload that will not be cached).
As you probably already know, the warning is related to idempotence (lack of side effects) in HTTP verbs. GET (among others) (should be at least) considered idempotent, while POST requests allow changes on the server. Therefore, the client must ask the user to confirm that he / she intends to perform the action again.
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