Demonstration API definition

openapi: "3.0.0"
info:
  version: 1.0.0
  title: Swagger Petstore
  license:
    name: MIT
servers:
  - url: http://petstore.swagger.io/v1
paths:
  /pets/{petId}:
    get:
      summary: Info for a specific pet
      operationId: showPetById
      tags:
        - pets
      parameters:
        - name: petId
          in: path
          required: true
          description: The id of the pet to retrieve
          schema:
            type: string
        - name: active
          in: query
          description: filter
          required: false
          allowEmptyValue: true
          schema:
            type: string
      responses:
        204:
          description: OK

Expected Behavior

I'd like to be able to choose if the optional query parameter active is sent or not.
I want to use the query parameter as filter without a value.

If enabled , the URL should look like this:
"http://petstore.swagger.io/v1/pets/{id}?active"
or
"http://petstore.swagger.io/v1/pets/{id}?active="
(Would be nicer without without the "=")

If disabled, the URL should look like this:
"http://petstore.swagger.io/v1/pets/{id}"

Current Behavior

Currently when I set 'allowEmptyValue: true', I can't choose whether I want to send the query parameter.
The URL always looks like this:
"http://petstore.swagger.io/v1/pets/{id}?active="

Possible Solution

A checkbox or another solution to choose whether to send the optional query parameter or not to send the query parameter