@omnigraph/openapi: How to differentiate between success/fail when API returns 204 without a response body?

[blakel6819]

Hello,

I am encountering issues using loadOpenAPISubgraph to generate a subgraph from a restful API with a path that has no response body type and only returns the the following responses:

"/check": {
	"post": {
		...
		"responses": {
			"204": {
				"description": "No description"
			},
			"401": {
				"description": "No description"
			},
		},
	},
},

The Mutation generated from the OpenAPI schema has no response type defined.

Check(
  input: checkRequest_Input
): Void @httpOperation(
  subgraph: "mySubgraph"
  path: "/check"
  operationSpecificHeaders: [[["Content-Type", "application/json"]]
  httpMethod: POST
) @inaccessible

The issue I am facing is that there is no way of determining if the request was successful or failed as the returned data is always the following:

{
  "data": {
    "mySubgraph": {
      "Check": null
    }
  }
}

With DEBUG enabled "Return type is not a JSON so returning" is logged (which indicates that the following line is hit) when trying to parse the response text:

• https://github.com/ardatan/graphql-mesh/blob/master/packages/transports/rest/src/directives/httpOperation.ts#L323

As no response type is defined for the Mutation, when the HTTP response is 401 I would have expected the else to be hit that returns and error which would allow distinction between a success vs fail response:

• https://github.com/ardatan/graphql-mesh/blob/master/packages/transports/rest/src/directives/httpOperation.ts#L345

Is there a way to configure the subgraph generated using loadOpenAPISubgraph to be able to return a response that can be differentiated between a success or failure based on the HTTP status response when a mutation has no return type?

[2024-12-12T09:16:56.903Z] DEBUG fetch - cc999716-9f7c-4967-b33d-b5b7b139e5a4  response {
  fetchId: '87b23a1a-5fc6-4d00-9631-6940342e9ef7',
  status: 401,
  headers: '{"content-length":"0","date":"Thu, 12 Dec 2024 09:16:56 GMT","server":"Kestrel"}',
  duration: 96.39049999999406
}
[2024-12-12T09:16:56.904Z] DEBUG cc999716-9f7c-4967-b33d-b5b7b139e5a4 - Mutation.Check  => Received {
  headers: Headers {
    'content-length': '0',
    date: [ 'Thu', '12 Dec 2024 09:16:56 GMT' ],
    server: 'Kestrel',
  },
  text: ''
}
[2024-12-12T09:16:56.907Z] DEBUG cc999716-9f7c-4967-b33d-b5b7b139e5a4 - Mutation.Check   => Return type is not a JSON so returning  
[2024-12-12T09:16:56.908Z] DEBUG mySubgraph - subgraph-execute  result {
  subgraphExecuteId: 'e152c911-b2e2-4b06-bb4f-e1eec5f7f73c',
  result: '{"data":{"__typename":"Mutation","Check":""}}'
}