message: improvement - use constructor instead of `create` method
diff: @@ -7,7 +7,7 @@ import { ServerError } from '../util/error.util';
  export const fromReadableStream = (stream: HttpRequest): Observable<any> => {
  stream.pause();
  - return Observable.create(observer => {
  + return new Observable(observer => {
  const next = chunk => observer.next(chunk);
  const complete = () => observer.complete();
  const error = err => observer.error(err);
  