HTTPInterceptor | Intercept HTTP network requests in iOS | Mock library

I have in my angular app many api calls, where I want to show a loading component, if data is coming from server.

For this I have a loader service like this:

Apparently throwError(error) is now deprecated. The IntelliSense of VS Code suggests throwError(() => new Error('error'). new Error(...) accepts only strings. What's the correct way to replace it without breaking my HttpErrorHandlerService ?

In angular application I want to encrypt the request and send it to server, also decrypt the response when receiving.

I have created a HttpInterceptor for both this task.

I am able to encrypt the request and it is working fine, But while decrypting response I am not able to do this.

Note : Both encrypt and decrypt are async methods:

After a user is authenticated, if user is of admin role, the menu items - movie, genres, actor and movie theater are shown in the menu else they remained hidden. After my WEBAPI returns role as "admin", the menu items remain hidden. I am not able to figure out the issue.

app-routing.module.ts

I have a dropdown text box that does type-ahead search. When I search for a valid item name (that exists in the DB), the search works fine and returns a list of items in the drop down to select from as I type. But when I search for invalid text, the API returns a 400 error (this is good), then the HttpErrorInterceptor intercepts that response in the catchError() method, and throws up an error popup. I don't want the error popup, I want it to forward the error to the text box logic so I can just display 'No Items Found' in the dropdown.

Text box html (uses Angular's NgbTypeahead):

In my Angular-13, I have this code:

I have an Angular project using Firebase for authentication. In order to authenticate to our server, we need the JWT from Firebase. The project is using Angular Fire to accomplish this.

We have an HTTP interceptor that intercepts any requests to the server, and adds the required Authorization header. The interceptor seems to work perfectly, but we would like to unit test it as well.

Our AuthService is responsible for delegating actions to Firebase. The getCurrentUserToken method retrieves the JWT as a promise, as Angular Fire will refresh the JWT if needed.

This complicates the interceptor slightly, since we need to asynchronously get the token and wrap it into the Observable from the request.

I have Angular 13 application and backend using ruby on rails. According to the Angular documentation https://angular.io/api/common/http/HttpClientXsrfModule#description, I should be able to simply use HttpClientXsrfModule for the XSRF protection. It has optional setting for cookieName and headerName. The problem is that in my case there is no CSRF cookie, the token is stored in the page header META tag. That's why I think that it's not possible to use HttpClientXsrfModule as documentation says.

Instead I'm going to implement a custom interceptor, however I have no idea how to get META tag value within Angular custom interceptor. https://angular.io/guide/http#intercepting-requests-and-responses

Please advice how can I get page header META tag value within Angular interceptor:

I want to add my authentication token in request header in my auth.interceptor.ts and I'm keeping authentication token value in my auth.service.ts. Here's auth.interceptor.ts