Yes. It must send an entity or redirect!
(Sorry, old programming jokes should come out sometimes).
It really depends on whether you can meaningfully give something GET that it makes sense to stand on it.
Example: Iām buying something, I get a page with the message "thank you, order number yadda yadda, receipt, yadda".
It should be 303 See Other redirect, so I get a page with this information. I can tag it later, refreshing only GET updates. Happy Days.
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