java http 401_401 API请求状态错误

当我试图实现只显示一条消息的简单web服务时,总是会遇到这个错误(angular5+springboot)

状态:401,状态文本:“确定”,网址:80/本地主机:你好“;,确定:

错误,}错误:“。。。标题:HttpHeaders

{normalizedNames:Map(0),lazyUpdate:null,lazyInit:}消息:

错误状态:“http401”状态确定“文本:

"80/本地主机:你好";

控制器.java:

@GetMapping("/hello")

public String sayhello(){ return "{\"message\": \"Hello, world!\"}";}

}

你好.component.ts:

import { Component, OnInit } from '@angular/core';

import { HttpClient, HttpErrorResponse, HttpParams } from '@angular/common/http';

import { Observable } from 'rxjs/Rx';

import { Adresse } from '../shared/adresse';

@Component({

selector: 'app-forgot', templateUrl: './forgot.component.html',

styleUrls: ['./forgot.component.css']

})

export class ForgotComponent implements OnInit {

message: string;

ip: string = Adresse.ip;

constructor(private http: HttpClient) { }

ngOnInit(): void {

this.http.get(this.ip + '/hello').subscribe(data => {

console.log('DATA', data);

this.message = data['message'];

})

}

}