How to vary requestBody type based on a path parameter in OpenAPI 3.0? - openapi

Question

In OpenAPI 2.0, in: body and in: formData parameters cannot exist together for the same operation, according to Swagger send body and formData parameter and OpenAPI 2.0 Specification. That makes sense.
But I'm using OpenAPI 3.0 and I wonder if there is a way to switch requestBody according to a path parameter? When store is path1, requestBody should use content with application/json; when store is path2, requestBody should use content with multipart/form-data.
/customs/{store}:
post:
description: Customs server calls Nomad to receive the filing result of one
order
operationId: post_customs_callback
parameters:
- description: ID of the store.
explode: true
in: path
name: store
required: true
schema:
type: string
style: simple
requestBody:
required: true
content:
multipart/form-data:
schema:
type: object
properties: # Request parts
openReq:
type: string
# application/json:
# schema:
# type: string
description: Order details

Answer 1

OpenAPI Specification does not have a way to vary request/response body based on specific parameter values. However, in your scenario you can use two non-parameterized paths instead – /customs/path1 for JSON requests and /customs/path2 for multipart requests.
openapi: 3.0.0
...
paths:
/customs/path1:
post:
...
requestBody:
required: true
content:
application/json:
schema:
...
/customs/path2:
post:
...
requestBody:
required: true
content:
multipart/form-data:
schema:
...