bug?: content type is always application/json or text/plain

[derdeka]

Steps to reproduce

I did some experiments of uml diagram generation with nomnoml as an lb4 extension. The output of an @get endpoint is an svg image.

AFAIK there is not way to set an content-type as strong-remoting is always setting text/plain !?:

https://github.com/strongloop/strong-remoting/blob/33fbd72fb46035f707c3c62dce6b36ab075fb61e/lib/http-context.js#L494-L498

Current Behavior

Content-Type is always application/json or text/plain.

Expected Behavior

Need Content-Type image/svg+xml for my use case.

Link to reproduction sandbox

https://github.com/derdeka/loopback4-extensions/blob/9d2ac1d877e2f8955a6bbcd9c9af3ec485f62d2e/packages/nomnoml/src/controllers/uml.controller.ts#L22

npm install @derdeka/loopback4-extension-nomnoml --save

in your application.ts:

import { ModelMetadataService, UmlBindings, UmlComponent, UmlConfig } from '@derdeka/loopback4-extension-nomnoml';
import * as AllModels from './models';

this.configure<UmlConfig>(UmlBindings.COMPONENT).to({
  umlPath: '/uml',
});
this.component(UmlComponent);
const service = this.getSync<ModelMetadataService>(UmlBindings.METADATA_SERVICE);
// eslint-disable-next-line @typescript-eslint/no-explicit-any
Object.values(AllModels).forEach((model: any) => service.inspect(model));

Additional Information

Maybe related to #2752 and #436

[dhmlau]

Discussed with @bajtos, he mentioned #2230 covers the requirement of this issue. I've added more information based on our conversation: #2230 (comment).

@derdeka, please try out the workaround and continue any discussion over #2230. I'd like to close this issue as duplicate. Thanks!

[derdeka]

@dhmlau Thanks for the hint. I've tested the workaround successfully - works for me.