mgr/dashboard: RGW is not working if an URL prefix is defined

Fixes https://tracker.ceph.com/issues/25068

This is the backport of #23200. It's not possible to cherry-pick it because the code has been changed too much from Mimic -> Nautilus.

Signed-off-by: Volker Theile <vtheile@suse.com>

src/pybind/mgr/dashboard/frontend/src/app/shared/api/rgw-bucket.service.ts

@@ -9,7 +9,7 @@ import { Observable } from 'rxjs/Observable';
 @Injectable()
 export class RgwBucketService {
 
-  private url = '/api/rgw/proxy/bucket';
+  private url = 'api/rgw/proxy/bucket';
 
   constructor(private http: HttpClient) { }
 
@@ -49,7 +49,7 @@ export class RgwBucketService {
       'bucket': bucket,
       'uid': uid
     };
-    return this.http.post('/api/rgw/bucket', body);
+    return this.http.post('api/rgw/bucket', body);
   }
 
   update(bucketId: string, bucket: string, uid: string) {

src/pybind/mgr/dashboard/frontend/src/app/shared/api/rgw-user.service.ts

@@ -9,7 +9,7 @@ import { Observable } from 'rxjs/Observable';
 @Injectable()
 export class RgwUserService {
 
-  private url = '/api/rgw/proxy/user';
+  private url = 'api/rgw/proxy/user';
 
   constructor(private http: HttpClient) { }
 
@@ -35,7 +35,7 @@ export class RgwUserService {
    * @return {Observable<string[]>}
    */
   enumerate() {
-    return this.http.get('/api/rgw/proxy/metadata/user');
+    return this.http.get('api/rgw/proxy/metadata/user');
   }
 
   get(uid: string) {