[BUG] typescript-axios not handling response headers

Description

tool either throws an error about response parameters (5.4.0), or silently ignores them (6.0.0)

openapi-generator version

5.4.0 emits an error
6.0.0 does not show an error, but there is no code to handle the Retry-After response header or constrain its type (to string)

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: Header Ref
  description: Demonstrate defect with a $ref to a response header
  version: 0.0.1
servers:
  - url: /issues
paths:
  /status:
    get:
      operationId: getStatus
      description: Get status
      responses:
        '202':
          description: Accepted.
          content:
            text/plain:
              schema:
                type: string
          headers:
            Retry-After:
              $ref: '#/components/headers/Retry-After'
components:
  headers:
    Retry-After:
      description: >-
        See [RFC7231: Retry-After](https://datatracker.ietf.org/doc/html/rfc7231#section-7.1.3)
      schema:
        type: string

Generation Details

openapi-generator-cli generate -g typescript-axios -i openapi.yaml -o sdk

Steps to reproduce

above command

for 5.4.0 I get

[main] ERROR o.o.codegen.DefaultCodegen - Not handling class Parameter {
    name: Retry-After
    in: header
    description: null
    required: null
    deprecated: null
    allowEmptyValue: null
    style: null
    explode: null
    allowReserved: null
    schema: null
    examples: null
    example: null
    content: null
    $ref: null
} as Body Parameter at the moment

for 6.0.0 the tool does not emit this ERROR but the emitted code does not support that response header.

Start with the openapi.yaml declaration and run the shown openapi-generator-cli command using the typescript-axios generator, comparing behavior between versions 5.4.0 and 6.0.0. Trace response-header handling in the generated SDK and generator implementation; done means the Retry-After header is emitted and constrained to string without the earlier parameter error.