Support GET with body in OpenApiResource endpoints

[okohub]

Springdoc version: 1.6.11

As of OAI/OpenAPI-Specification#2117, body in GET-HEAD-DELETE now supported in OAS 3.1.0

Even I set open api version to 3.1 in properties;

 springdoc:
   api-docs:
     version: openapi_3_1

org.springdoc.webmvc.api.OpenApiResource#openapiJson still creates documentation in legacy structure. I would like to see support of "requestBody" in GET, in springdoc codes.

There are 2 blocking logics exist in AbstractRequestService;

1. org.springdoc.core.AbstractRequestService#isRequestBodyParam (which is blocking GET)

2. org.springdoc.core.AbstractRequestService.java:308 (which is an if logic for GET)

If I override those logics with copying some of code, replacing RequestService with new custom one, everything works fine :) I can create something like this;

    "/api/tests/getmebody" : {
      "get" : {
        "tags" : [ "Test" ],
        "operationId" : "getMeBody",
        "requestBody" : {
          "content" : {
            "application/json" : {
              "schema" : {
                "$ref" : "#/components/schemas/NewRequest"
              }
            }
          },
          "required" : true
        },
        "responses" : {
          "200" : {
            "description" : "OK",
            "content" : {
              "*/*" : {
                "schema" : {
                  "$ref" : "#/components/schemas/Response"
                }
              }
            }
          }
        }
      }
    }

What do you think? Can we improve AbstractRequestService to generate openapi spec correctly?

Thanks.

[bnasslahsen]

@okohub,

Feel free to propose a PR and link it to this ticket and i will review it.

[okohub]

@bnasslahsen thanks will take a look 🎈