fix rocket chat session

src/app/services/chat.service.ts

@@ -13,7 +13,7 @@ import { Observable, Subject } from "rxjs/Rx";
   providedIn: 'root'
 })
 export class ChatService {
-  headers: HttpHeaders;
+  _headers: HttpHeaders;
   options:any;
   options1:any;
   X_User_Id:any;
@@ -31,19 +31,23 @@ export class ChatService {
     private storage: Storage,
     private storageService:StorageService,
     )
-    {
-      this.setHeader()
-      window['setChatHeader'] = this.setHeader
+    {}
+
+
+    get headers() {
+      this.loggedUserChat = this.authService.ValidatedUserChat;
+      this._headers = new HttpHeaders();
+      this._headers = this._headers.set('X-User-Id', this.loggedUserChat['data'].userId);
+      this._headers = this._headers.set('X-Auth-Token', this.loggedUserChat['data'].authToken);
+      this.options = {
+        headers: this._headers,
+      };
+
+      return this._headers
     }
 
     setHeader = () => {
-      this.loggedUserChat = this.authService.ValidatedUserChat;
-      this.headers = new HttpHeaders();
-      this.headers = this.headers.set('X-User-Id', this.loggedUserChat['data'].userId);
-      this.headers = this.headers.set('X-Auth-Token', this.loggedUserChat['data'].authToken);
-      this.options = {
-        headers: this.headers,
-      };
+
     }
 
     getDocumentDetails(url:string){