error.interceptor.ts
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	import { Injectable } from '@angular/core';
	import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor } from '@angular/common/http';
	import { Observable, throwError } from 'rxjs';
	import { catchError } from 'rxjs/operators';
	import { AuthenticationService } from '../_services';

	// Error interceptor
	@Injectable()
	export class ErrorInterceptor implements HttpInterceptor {
	constructor(private authenticationService: AuthenticationService) {}

	intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
	return next.handle(request).pipe(catchError(err => {
	if (err.status === 401) {
	// auto logout if 401 response returned from api
	this.authenticationService.logout();
	location.reload(true);
	}

	const error = err.error.message \|\| err.statusText;
	return throwError(error);
	}));
	}
	}