Problema na paginação

Estou com problema na paginação. Meu código está de acordo com o que foi passado na aula e mesmo assim a paginação não funciona. Está retornando todos as fotos mesmo com a paginação definida. Photo.service.ts

import { HttpClient, HttpParams } from "@angular/common/http";
import { Injectable } from "@angular/core";
import { Photo } from "../photo/photo";

const API = "http://localhost:3000";

@Injectable({ providedIn: "root" })
export class PhotoService {
  constructor(private http: HttpClient) {}

  listFromUsers(userName: string) {
    return this.http.get<Photo[]>(API + "/" + userName + "/photos");
  }

  listFromUserPaginated(userName: string, page: number) {
    const params = new HttpParams().append("page", page.toString());

    return this.http.get<Photo[]>(API + "/" + userName + "/photos", {
      params: params
    });
  }
}

photo-list.resolver.ts

  import { Injectable } from "@angular/core";
  import { Observable } from "rxjs";
  import {Resolve, ActivatedRouteSnapshot, RouterStateSnapshot } from "@angular/router";

  import { PhotoService } from "./../services/photo.service";
  import { Photo } from "./../photo/photo";

  @Injectable({ providedIn: "root" })
  export class PhotoListResolver implements Resolve<Observable<Photo[]>>
  {
    constructor(private service: PhotoService) {}

    resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<Photo[]> {
      const userName = route.params.userName;
      return this.service.listFromUserPaginated(userName, 1);
    }
  }