Too many servers ignore/drop/reject body in GET requests. RFC 9110 does allow it, but is only recommended if server documentation states that it is supported.

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stymaar 2 hours ago | parent [-]

These servers will likely also reject the QUERY request though…

	▲	greghines 2 hours ago \| parent [-]
		But at least in that case you may get a much more meaningful 405 Method Not Allowed response rather than the server just silently dropping the GET body content.