Enable overriding HttpErrorHandlerInterceptor

[timdk]

Is your feature request related to a problem? Please describe.

Related to new feature Server-Side Rendering Error Handling

We can add additional interceptors but can't replace or extend the OOTB implementation.

I think that overriding it is supposed to be possible due to the following statement in the documentation

The composable storefront HttpErrorHandlerInterceptor treats all outbound HTTP as a reason to make SSR fail.

However, if this assumption is not true for your application, you can customize it by over-providing the composable storefront HttpErrorHandlerInterceptor.

Describe the solution you'd like

The service is provided with useClass and it doesn't have the providedIn: 'root' annotation.

@Injectable()
export class HttpErrorHandlerInterceptor implements HttpInterceptor {

// HttpErrorHandlerModule
{
  provide: HTTP_INTERCEPTORS,
  useClass: HttpErrorHandlerInterceptor,
  multi: true,
},

I would like to replace it like so:

{
  provide: HttpErrorHandlerInterceptor,
  useClass: CustomHttpErrorHandlerInterceptor,
},

The WithCredentialsInterceptor is provided in root and injected using useExisting.

@Injectable({ providedIn: 'root' })
export class WithCredentialsInterceptor implements HttpInterceptor {

// BaseOccModule
{
  provide: HTTP_INTERCEPTORS,
  useExisting: WithCredentialsInterceptor,
  multi: true,
},

The following override works

{
  provide: WithCredentialsInterceptor,
  useClass: CustomWithCredentialsInterceptor,
},

Describe alternatives you've considered

Adding additional interceptors works for now, but multiple errors are logged. E.g. from my SSR logs:

{
  message: 'ProductNotFoundOutboundHttpError: Product Not Found\n' + ...
},
{
  message: 'OutboundHttpError: Outbound HTTP Error\n' + ...
},
{
  message: 'Error: Failed to set cms page index\n' + ...
}

The OutboundHttpError is coming from the base HttpErrorHandlerInterceptor.