How to return response object for bad request from Angular service to component

Question

API returns below type of response -

export class ResponseObject{
statusCode: Number;
statusMessage: string;
response: string;
}

Service -

 singIn(user: User): Observable<ResponseObject>{
    return this._httpClient.post<ResponseObject>(`${this._svcURL}/users/signin`, user, this._httpOptions)
    .pipe(catchError(this.handleError));    
  }

  private handleError(errResponse: HttpErrorResponse){
    if(errResponse.error instanceof ErrorEvent){
      console.log("[Service] Client side error-",errResponse.error.message);
    }
    else{
      console.log("[Service]", errResponse);
    }
    return throwError("Oops! There is an issue with service. We're working on it.");
  }

Component -

loginUser(signinForm: any): void{
    let user: User = {
      email: signinForm.email,
      password: signinForm.password
    };
    console.log('[LOGIN-COMPONENT] User details ', user);

    this._moovApiService.singIn(user)
      .subscribe((response: ResponseObject) => this.responseObject = response,
      err => {
        console.log('[LOGIN-COMPONENT] ', err);
      },
      () => {
        console.log('[LOGIN-COMPONENT] Response from service ', this.responseObject);
      }
    );
  }

I am able to get values for ResponseObject type if the API returns success(200, 201), but if it is a bad request(404, 400) it doesn't return any values for ResponseObject. It ends up in handleError() method.

I want to get response for all status codes in my component and then process it. How I can do that?

Answer 1

If you want all HTTP status codes to be treated as data and not as an error, you need to return a false Observable from your handleError . example:

private handleError(errResponse: HttpErrorResponse){
    return Observable.of(false);
}

Answer 2

I would put handleError() as public and do

this._moovApiService.singIn(user).subscribe(
  (data) => this.response = data,
  (err) => {
    this._moovApiService.handleError(err)
    this.response = // put any value you want here
  },
  //() => complete
)

Answer 3

Catch error before the subscription.

loginUser(signinForm: any): void {
        let user: User = {
            email: signinForm.email,
            password: signinForm.password
        };

        console.log('[LOGIN-COMPONENT] User details ', user);

        this._moovApiService.singIn(user).pipe(catchError(err => {
                console.log('[LOGIN-COMPONENT] ', err);
            }))
            .subscribe((response: ResponseObject) => {
                this.responseObject = response;
                console.log('[LOGIN-COMPONENT] Response from service ', this.responseObject);
            });
    }