When invoke the lambda function with a function URL, you can use any HTTP method: GET, POST, DELETE, PATCH, PUT…, Lambda will treat all of them as the same.
Try it with GET
curl 'https://qzpsv22gd3s4qbnfwz2v5yefoy0dmipa.lambda-url.ap-southeast-1.on.aws/' \
-X GET \
-H 'content-type: application/json' \
-d '{ "id": "a3127179-6ba4-4c3b-855a-4f65d4ee6345" }'
Or POST
curl 'https://qzpsv22gd3s4qbnfwz2v5yefoy0dmipa.lambda-url.ap-southeast-1.on.aws/' \
-X GET \
-H 'content-type: application/json' \
-d '{ "id": "a3127179-6ba4-4c3b-855a-4f65d4ee6345" }'
You requests will all succeed and you will receive the same response.