Apache 301 Redirect and preserving post data

Using a 307 should be exactly what you want

307 Temporary Redirect (since HTTP/1.1)
In this case, the request should be repeated with another URI; however, future requests
should still use the original URI.[2] In contrast to how 302 was historically implemented,
the request method is not allowed to be changed when reissuing the original request. For
instance, a POST request should be repeated using another POST request

Wikipedia

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