[BUG] it seems that cpp-qt5-qhttpengine-server doesn't support form data(x-www-form-urlencoded)

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

I am using openapi-generator to generate qt server stub(-g cpp-qt5-qhttpengine-server). I found that the generated stub code doesn't handle form param correctly, only define the vaiables and do nothing. and I want to handle it myself manually. but it seems the underlying library qhttpengine actually dones't support form data, it only support body in json format. But I can not find any statement in cpp-qt5-qhttpengine-server or qhttpengine said that it doesn't support form data. So am I wrong, or something wrong?

openapi-generator version

5.1.1

OpenAPI declaration file content or url

I only paste some part of it, actually, all form parameter have this probolem.

        "/mytest/CreateTestEntity": {
            "post": {
                "description": "",
                "consumes": [
                    "application/x-www-form-urlencoded"
                ],
                "produces": [
                    "application/json"
                ],
                "tags": [
                    "mytest"
                ],
                "summary": "CreateTestEntity",
                "parameters": [
                    {
                        "type": "string",
                        "description": "Token",
                        "name": "token",
                        "in": "header",
                        "required": true
                    },
                    {
                        "type": "string",
                        "description": "",
                        "name": "name",
                        "in": "formData",
                        "required": true
                    },
                    {
                        "type": "integer",
                        "description": "",
                        "name": "intValue",
                        "in": "formData",
                        "required": true
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK",
                        "schema": {
                            "$ref": "#/definitions/netmodel.CreateTestEntityResult"
                        }
                    }
                }
            }
        }

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

I just want to known whether this is a desired behavior, if it is, could the document be updated.

Start by reproducing generation with the provided application/x-www-form-urlencoded specification and the cpp-qt5-qhttpengine-server generator. Inspect the generated handling of the formData parameters and determine whether the limitation belongs to the generator or qhttpengine. Done means establishing the intended behavior and either documenting the limitation or identifying a concrete fix scope.