How to specify OpenAPI for binary download in angular

I have a method to download a binary file. This currently has the following spec in openapi.yaml:

/processing/getZippedReports:
post:
tags:
- ProcessingRest
description: Get the reports
operationId: getZippedReports
requestBody:
description: The list of items for which to get the HTML
content:
application/json:
schema:
type: array
items:
type: string
required: true
responses:
200:
description: file with zipped reports
content:
application/octet-stream: {}


The generated typescript-angular code contains this call to httpClient:

return this.httpClient.post<any>(`${this.configuration.basePath}/processing/getZippedReports`,
requestBody,
{
withCredentials: this.configuration.withCredentials,
headers: headers,
observe: observe,
reportProgress: reportProgress
}
);


This way, angular seems unable to receive the binary content. I had to change the httpClient, use the non-type-variable signature of post and add responseType: blob to the parameters

return this.httpClient.post(`${this.configuration.basePath}/processing/getZippedReports`,
requestBody,
{
withCredentials: this.configuration.withCredentials,
headers: headers,
observe: 'response',
responseType: 'blob',
reportProgress: reportProgress
}
);


Is this a bug / missing feature in Swagger codegen or should I change the openapi definition to get working angular code?

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