setAlert(params: SetAlertParams) {
    return this.http.get<{user: string, password: string}>(urls.getCredentials).pipe(
        switchMap(credentials => {
            const headers = new HttpHeaders({
                'Content-Type': 'application/json',
                'Authentication': `Basic ${btoa(`${credentials.user}${credentials.password}`)}`
            });
            const formData = new FormData();
            Object.keys(params).forEach(key => formData.append(key, params[key]));
            return this.http.post<SetAlertResult>(urls.setAlert, formData, {
                headers: headers,
                withCredentials: true
            });
        }
    ));
}