GET request not supported in custom API in Business Central. "BadRequest_MethodNotAllowed"

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I try to call a method in a custom API in a code unit in Ms Dynamics 365 Business Central. I tried everything to make it a simple GET method, but I keep receiving "BadRequest_MethodNotAllowed" in Postman.
Ms Dynamics 365 Business Central
BadRequest_MethodNotAllowed
BadRequest_MethodNotAllowed
The complete response:
{
"error": {
"code": "BadRequest_MethodNotAllowed",
"message": "'GET' requests on unbound actions are not allowed."
}
}

{
"error": {
"code": "BadRequest_MethodNotAllowed",
"message": "'GET' requests on unbound actions are not allowed."
}
}

When I call the method with a POST request (in Postman), it works as expected.
To me it seems absurd the caller of my API need to use POST when het wants to GET some data from my API. This is of course also against official guide lines and conventions.
Am I missing something? Please some advice. Thank you.
POST
GET
Tags: rest,get,dynamics-business-centralSource of the question:
https://stackoverflow.com/questions/78996083

Question and source license information:
https://meta.stackexchange.com/help/licensing
https://stackoverflow.com/

Видео GET request not supported in custom API in Business Central. "BadRequest_MethodNotAllowed" канала Emrah KAYA