[BUG] [Feign] Incorrect generated format with Content-Type: application/x-www-form-urlencoded

[amarrategui]

Description

Hi, we are trying to genenerate an feign client to call an Oauth2 token method. In curl, this call is like this:

curl --request POST \
  --url https://xxxxxxxxxxxxxx/oauth2/v1/token \
  --header 'Authorization: Basic XXXXXXXX' \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --header 'User-Agent: insomnia/9.3.2' \
  --data username=XXXXX \
  --data password=XXXXX \
  --data grant_type=password \
  --data scope=XXXXXXXXXXX/super_scope+offline_access 

but when we run the openapi generator, feign is doing this call:

https://xxxxxxxxx/oauth2/v1/token?username=XXXXXX&password=XXXXX&grant_type=password&scope=XXXXX/super_scope+offline_access'

that retuns a bad request exception

openapi-generator version

3.0.1

OpenAPI declaration file content or url

/token:
post:
tags:
- "Oauth2"
summary: "Generate new access and refresh token"
description: ""
operationId: "token"
parameters:
- in: "header"
name: "Authorization"
description: "Basic authentication"
required: true
schema:
type: string
requestBody:
description: Session credentials
content:
application/x-www-form-urlencoded:
schema:
$ref: "#/components/schemas/TokenRequest"
responses:
"200":
description: "Successful operation"
content:
application/json:
schema:
title: "TokenResponse"
oneOf:
- $ref: "#/components/schemas/OauthSuccess"
- $ref: "#/components/schemas/OauthError"
"400":
description: "Bad request"
content:
application/json:
schema:
$ref: "#/components/schemas/OauthError"
"401":
description: "Forbidden"
content:
application/json:
schema:
$ref: "#/components/schemas/OauthError"

Can help me to try to generate the request so that the parameters appear in the body and not in the URL?