google-cloud-run - GCP API Gateway 为 HTTP GET 方法传递 JSON 有效负载

Question

/test:
    get:
      summary: Get an Employee
      operationId: getEmployee
      x-google-backend:
        address: https://xyz-nn.a.run.app #Cloud RUN URL
        protocol: h2
      parameters:
        - name: employee_id
          in: query
          description: Employee Id
          required: true
          type: string
        - name: employee
          in: body
          description: Employee to be Added
          schema:
            $ref: '#/definitions/Employee'
      responses:
        '200':
          description: A successful response
          schema:
            type: string
        '404':
          description: A Employee with the specified ID was not found.
          schema:
            type: string
        '412':
          description: Employee Id not provided
          schema:
            type: string

这里使用了 GET 请求，但 API Gateway 给了我 400。如何在 GET 请求中传递正文参数以及查询参数。