Being able to provide an abstract HttpClient

[philly-vanilly]

Is your feature request related to a problem? Please describe.
I want to be able to use @ionic-native/http/ngx with HTTPS pinning in a mobile/Ionic app.

Describe the solution you'd like
By default, the plugin should still use Angular HttpClient, but there should be an option to replace it. I am thinking of something like:

export interface OAuthHttpClient {
   // options should probably have an own interface; too bad node_modules/@angular/common/http/http.d.ts does not provide one
    get<T>(endpoint: string, options: any): Observable<T>;
    // post and other methods used in the lib as well
}

And then, in the lib-consumer you could do something like:

import { OAuthHttpClient } from 'angular-oauth2-oidc';
import { HTTP } from "@ionic-native/http/ngx";

@Injectable({providedIn: "root"})
export class MyOwnHttpClient implements OAuthHttpClient {
    constructor(private nativeHttp: HTTP){}

    get<T>(endpoint: string, options: any): Observable<T> {
        await this.nativeHttp.setServerTrustMode("pinned");
        ...
        this.nativeHttp.sendRequest(endpoint, {
                    method: "get",
                    params: options.params,
                    headers: options.headers,
                    responseType: options.responseType,
                })
    }
}

and set it in the AuthConfig or do sth like this (but I think this would break your backward-compatibility):

{
    provide: OAuthHttpClient,
    useClass: MyOwnHttpClient // this way you could remote "providedIn: root"
}

Describe alternatives you've considered
Using an Ionic specific lib...

Additional context
Nothing for now

[philly-vanilly]

Since the Angular HtpClient is huge, one would need to extract only the methods into an abstract interface which are used in oauth-service.ts, e.g.

this.http.get<OidcDiscoveryDoc>(fullUrl).subscribe(
this.http.get(this.jwksUri).subscribe(
this.http.get<UserInfo>(this.userinfoEndpoint, { headers })
this.http.post<TokenResponse>(this.tokenEndpoint, params, { headers })
...

should be covered

[wellwoller]

Any progress on this issue yet?