diff --git a/client/proxy.conf.json b/client/proxy.conf.json
index a5180e715..ef96b287f 100644
--- a/client/proxy.conf.json
+++ b/client/proxy.conf.json
@@ -1,13 +1,13 @@
 {
-    "/users/login": {
+    "/apps/users/login": {
         "target": "http://localhost:8000",
         "secure": false
     },
-    "/users/logout": {
+    "/apps/users/logout": {
         "target": "http://localhost:8000",
         "secure": false
     },
-    "/users/whoami": {
+    "/apps/users/whoami": {
         "target": "http://localhost:8000",
         "secure": false
     },
diff --git a/client/src/app/core/core.module.ts b/client/src/app/core/core.module.ts
index 28352a857..f98b78c4f 100644
--- a/client/src/app/core/core.module.ts
+++ b/client/src/app/core/core.module.ts
@@ -12,6 +12,7 @@ import { OperatorService } from './services/operator.service';
 import { WebsocketService } from './services/websocket.service';
 import { AddHeaderInterceptor } from './http-interceptor';
 import { DataSendService } from './services/data-send.service';
+import { ViewportService } from './services/viewport.service';
 
 /** Global Core Module. Contains all global (singleton) services
  *
@@ -26,6 +27,7 @@ import { DataSendService } from './services/data-send.service';
         DataStoreService,
         DataSendService,
         OperatorService,
+        ViewportService,
         WebsocketService,
         {
             provide: HTTP_INTERCEPTORS,
diff --git a/client/src/app/core/services/auth.service.ts b/client/src/app/core/services/auth.service.ts
index e02b6b83d..b418ffc52 100644
--- a/client/src/app/core/services/auth.service.ts
+++ b/client/src/app/core/services/auth.service.ts
@@ -5,6 +5,7 @@ import { catchError, tap } from 'rxjs/operators';
 
 import { OperatorService } from 'app/core/services/operator.service';
 import { OpenSlidesComponent } from '../../openslides.component';
+import { environment } from 'environments/environment';
 
 /**
  * Authenticates an OpenSlides user with username and password
@@ -44,7 +45,7 @@ export class AuthService extends OpenSlidesComponent {
             username: username,
             password: password
         };
-        return this.http.post<any>('/users/login/', user).pipe(
+        return this.http.post<any>(environment.urlPrefix + '/users/login/', user).pipe(
             tap(resp => this.operator.storeUser(resp.user)),
             catchError(this.handleError())
         );
@@ -60,6 +61,6 @@ export class AuthService extends OpenSlidesComponent {
     //TODO not yet used
     logout(): Observable<any> {
         this.operator.clear();
-        return this.http.post<any>('/users/logout/', {});
+        return this.http.post<any>(environment.urlPrefix + '/users/logout/', {});
     }
 }
diff --git a/client/src/app/core/services/operator.service.ts b/client/src/app/core/services/operator.service.ts
index 30d25ee31..420f2693c 100644
--- a/client/src/app/core/services/operator.service.ts
+++ b/client/src/app/core/services/operator.service.ts
@@ -5,6 +5,7 @@ import { tap, catchError, share } from 'rxjs/operators';
 import { OpenSlidesComponent } from 'app/openslides.component';
 import { Group } from 'app/shared/models/users/group';
 import { User } from '../../shared/models/users/user';
+import { environment } from 'environments/environment';
 
 /**
  * The operator represents the user who is using OpenSlides.
@@ -74,10 +75,10 @@ export class OperatorService extends OpenSlidesComponent {
     }
 
     /**
-     * calls `/users/whoami` to find out the real operator
+     * calls `/apps/users/whoami` to find out the real operator
      */
     public whoAmI(): Observable<any> {
-        return this.http.get<any>('/users/whoami/').pipe(
+        return this.http.get<any>(environment.urlPrefix + '/users/whoami/').pipe(
             tap(whoami => {
                 if (whoami && whoami.user) {
                     this.storeUser(whoami.user as User);
diff --git a/client/src/app/core/services/viewport.service.spec.ts b/client/src/app/core/services/viewport.service.spec.ts
new file mode 100644
index 000000000..9bf530451
--- /dev/null
+++ b/client/src/app/core/services/viewport.service.spec.ts
@@ -0,0 +1,15 @@
+import { TestBed, inject } from '@angular/core/testing';
+
+import { ViewportService } from './viewport.service';
+
+describe('ViewportService', () => {
+    beforeEach(() => {
+        TestBed.configureTestingModule({
+            providers: [ViewportService]
+        });
+    });
+
+    it('should be created', inject([ViewportService], (service: ViewportService) => {
+        expect(service).toBeTruthy();
+    }));
+});
diff --git a/client/src/app/core/services/viewport.service.ts b/client/src/app/core/services/viewport.service.ts
new file mode 100644
index 000000000..14b360001
--- /dev/null
+++ b/client/src/app/core/services/viewport.service.ts
@@ -0,0 +1,30 @@
+import { Injectable } from '@angular/core';
+import { BreakpointObserver, Breakpoints, BreakpointState } from '@angular/cdk/layout';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class ViewportService {
+    /**
+     * True if Viewport equals mobile or small resolution.
+     */
+    private _isMobile = false;
+
+    constructor(private breakpointObserver: BreakpointObserver) {}
+
+    checkForChange() {
+        this.breakpointObserver
+            .observe([Breakpoints.Small, Breakpoints.HandsetPortrait])
+            .subscribe((state: BreakpointState) => {
+                if (state.matches) {
+                    this._isMobile = true;
+                } else {
+                    this._isMobile = false;
+                }
+            });
+    }
+
+    get isMobile() {
+        return this._isMobile;
+    }
+}
diff --git a/client/src/app/site/site.component.html b/client/src/app/site/site.component.html
index 18a4f37c1..fcc467f34 100644
--- a/client/src/app/site/site.component.html
+++ b/client/src/app/site/site.component.html
@@ -1,5 +1,5 @@
 <mat-sidenav-container autosize class='main-container'>
-    <mat-sidenav #sideNav [mode]="isMobile ? 'push' : 'side'" [opened]='!isMobile' disableClose='!isMobile' class="side-panel">
+    <mat-sidenav #sideNav [mode]="vp.isMobile ? 'push' : 'side'" [opened]='!vp.isMobile' disableClose='!vp.isMobile' class="side-panel">
         <mat-toolbar class='nav-toolbar'>
             <!-- logo -->
             <mat-toolbar-row class='os-logo-container'>
@@ -42,39 +42,39 @@
         <!-- navigation -->
         <mat-nav-list class='main-nav'>
             <a [@navItemAnim] *appOsPerms="['core.can_see_frontpage']" mat-list-item routerLink='/' routerLinkActive='active' [routerLinkActiveOptions]="{exact: true}"
-                (click)='isMobile ? sideNav.toggle() : null'>
+                (click)='toggleSideNav()'>
                 <fa-icon icon='home'></fa-icon>
                 <span translate>Home</span>
             </a>
-            <a [@navItemAnim] *appOsPerms="['agenda.can_see']" mat-list-item routerLink='/agenda' routerLinkActive='active' (click)='isMobile ? sideNav.toggle() : null'>
+            <a [@navItemAnim] *appOsPerms="['agenda.can_see']" mat-list-item routerLink='/agenda' routerLinkActive='active' (click)='toggleSideNav()'>
                 <fa-icon icon='calendar'></fa-icon>
                 <span translate>Agenda</span>
             </a>
-            <a [@navItemAnim] *appOsPerms="['motions.can_see']" mat-list-item routerLink='/motions' routerLinkActive='active' (click)='isMobile ? sideNav.toggle() : null'>
+            <a [@navItemAnim] *appOsPerms="['motions.can_see']" mat-list-item routerLink='/motions' routerLinkActive='active' (click)='toggleSideNav()'>
                 <fa-icon icon='file-alt'></fa-icon>
                 <span translate>Motions</span>
             </a>
             <a [@navItemAnim] *appOsPerms="['assignments.can_see']" mat-list-item routerLink='/assignments' routerLinkActive='active'
-                (click)='isMobile ? sideNav.toggle() : null'>
+                (click)='vp.isMobile ? sideNav.toggle() : null'>
                 <fa-icon icon='chart-pie'></fa-icon>
                 <span translate>Assignments</span>
             </a>
-            <a [@navItemAnim] *appOsPerms="['users.can_see_name']" mat-list-item routerLink='/users' routerLinkActive='active' (click)='isMobile ? sideNav.toggle() : null'>
+            <a [@navItemAnim] *appOsPerms="['users.can_see_name']" mat-list-item routerLink='/users' routerLinkActive='active' (click)='toggleSideNav()'>
                 <fa-icon icon='user'></fa-icon>
                 <span translate>Participants</span>
             </a>
-            <a [@navItemAnim] *appOsPerms="['mediafiles.can_see']" mat-list-item routerLink='/mediafiles' routerLinkActive='active' (click)='isMobile ? sideNav.toggle() : null'>
+            <a [@navItemAnim] *appOsPerms="['mediafiles.can_see']" mat-list-item routerLink='/mediafiles' routerLinkActive='active' (click)='toggleSideNav()'>
                 <fa-icon icon='paperclip'></fa-icon>
                 <span translate>Files</span>
             </a>
             <a [@navItemAnim] *appOsPerms="['core.can_manage_config']" mat-list-item routerLink='/settings' routerLinkActive='active'
-                (click)='isMobile ? sideNav.toggle() : null'>
+                (click)='toggleSideNav()'>
                 <fa-icon icon='cog'></fa-icon>
                 <span translate>Settings</span>
             </a>
             <mat-divider></mat-divider>
             <a [@navItemAnim] *appOsPerms="['core.can_see_projector']" mat-list-item routerLink='/projector' routerLinkActive='active'
-                (click)='isMobile ? sideNav.toggle() : null'>
+                (click)='toggleSideNav()'>
                 <fa-icon icon='video'></fa-icon>
                 <span translate>Projector</span>
             </a>
@@ -83,18 +83,15 @@
 
         <footer>
             <button mat-button>
-                <a routerLink='/legalnotice' (click)='isMobile ? sideNav.toggle() : null'>
+                <a routerLink='/legalnotice' (click)='toggleSideNav()'>
                     <span translate>Legal Notice</span>
                 </a>
             </button>
             <button mat-button>
-                <a routerLink='/privacypolicy' (click)='isMobile ? sideNav.toggle() : null'>
+                <a routerLink='/privacypolicy' (click)='toggleSideNav()'>
                     <span translate>Privacy Policy</span>
                 </a>
             </button>
-            <!-- <button mat-button (click)='openPrivacyPolicy()'>
-                <span translate>Privacy Policy</span>
-            </button> -->
             <br>
             <span align="center">© Copyright by
                 <a href='https://openslides.org/'>OpenSlides</a>
@@ -107,7 +104,7 @@
     <mat-toolbar color='primary'>
 
         <!-- show/hide menu button -->
-        <button mat-icon-button *ngIf="isMobile" (click)='sideNav.toggle()'>
+        <button mat-icon-button *ngIf="vp.isMobile" (click)='sideNav.toggle()'>
             <fa-icon icon='bars'></fa-icon>
         </button>
 
@@ -122,4 +119,4 @@
     <main [@pageTransition]="o.isActivated ? o.activatedRoute : ''">
         <router-outlet #o="outlet"></router-outlet>
     </main>
-</mat-sidenav-container>
\ No newline at end of file
+</mat-sidenav-container>
diff --git a/client/src/app/site/site.component.ts b/client/src/app/site/site.component.ts
index f9fd31883..005584584 100644
--- a/client/src/app/site/site.component.ts
+++ b/client/src/app/site/site.component.ts
@@ -1,4 +1,4 @@
-import { Component, OnInit, HostBinding } from '@angular/core';
+import { Component, OnInit, HostBinding, ViewChild } from '@angular/core';
 import { Router } from '@angular/router';
 import { BreakpointObserver, Breakpoints, BreakpointState } from '@angular/cdk/layout';
 
@@ -9,7 +9,8 @@ import { OperatorService } from 'app/core/services/operator.service';
 import { TranslateService } from '@ngx-translate/core'; //showcase
 import { BaseComponent } from 'app/base.component';
 import { pageTransition, navItemAnim } from 'app/shared/animations';
-import { MatDialog } from '@angular/material';
+import { MatDialog, MatSidenav } from '@angular/material';
+import { ViewportService } from '../core/services/viewport.service';
 
 @Component({
     selector: 'app-site',
@@ -18,16 +19,16 @@ import { MatDialog } from '@angular/material';
     styleUrls: ['./site.component.scss']
 })
 export class SiteComponent extends BaseComponent implements OnInit {
+    /**
+     * HTML element of the side panel
+     */
+    @ViewChild('sideNav') sideNav: MatSidenav;
+
     /**
      * Get the username from the operator (should be known already)
      */
     username = this.operator.username;
 
-    /**
-     * True if Viewport equals mobile or small resolution. Set by breakpointObserver.
-     */
-    isMobile = false;
-
     /**
      * Constructor
      *
@@ -44,7 +45,7 @@ export class SiteComponent extends BaseComponent implements OnInit {
         private autoupdateService: AutoupdateService,
         private operator: OperatorService,
         private router: Router,
-        private breakpointObserver: BreakpointObserver,
+        public vp: ViewportService,
         public translate: TranslateService,
         public dialog: MatDialog
     ) {
@@ -55,15 +56,7 @@ export class SiteComponent extends BaseComponent implements OnInit {
      * Initialize the site component
      */
     ngOnInit() {
-        this.breakpointObserver
-            .observe([Breakpoints.Small, Breakpoints.HandsetPortrait])
-            .subscribe((state: BreakpointState) => {
-                if (state.matches) {
-                    this.isMobile = true;
-                } else {
-                    this.isMobile = false;
-                }
-            });
+        this.vp.checkForChange();
 
         // get a translation via code: use the translation service
         // this.translate.get('Motions').subscribe((res: string) => {
@@ -82,6 +75,15 @@ export class SiteComponent extends BaseComponent implements OnInit {
         });
     }
 
+    /**
+     * Closes the sidenav in mobile view
+     */
+    toggleSideNav() {
+        if (this.vp.isMobile) {
+            this.sideNav.toggle();
+        }
+    }
+
     /**
      * Let the user change the language
      * @param lang the desired language (en, de, fr, ...)
diff --git a/client/src/environments/environment.ts b/client/src/environments/environment.ts
index a4c9f5fe4..cbc0b92a1 100644
--- a/client/src/environments/environment.ts
+++ b/client/src/environments/environment.ts
@@ -3,7 +3,8 @@
 // The list of file replacements can be found in `angular.json`.
 
 export const environment = {
-    production: false
+    production: false,
+    urlPrefix: '/apps'
 };
 
 /*