Angular 在使用角度为4的信号器进行协商请求期间，我遇到未经授权的401错误

在协商请求期间，我使用角度为4的信号R收到未经授权的401错误。这是我的密码

  this.connection = $.hubConnection('http://localhost:53248/signalr', 
    {useDefaultPath: false,
    'Authorization':'Bearer '+localStorage.getItem('access_token')});
    this.proxy = this.connection.createHubProxy('AuctionHub');

  private startConnection(): void {  
    this.connection.start({ jsonp: true }).done((data: any) => {  
        console.log('Now connected ' + data.transport.name + ', connection ID= ' + data.id);  
        this.connectionEstablished.emit(true);  
        this.connectionExists = true;  
    }).fail((error: any) => {  
        console.log('Could not connect ' + error);  
        this.connectionEstablished.emit(false);  
    });  
}  

以下是连接到AuctionHub时出现的错误。我应该如何解决我的错误。这是我的密码

  this.connection = $.hubConnection('http://localhost:53248/signalr', 
    {useDefaultPath: false,
    'Authorization':'Bearer '+localStorage.getItem('access_token')});
    this.proxy = this.connection.createHubProxy('AuctionHub');

  private startConnection(): void {  
    this.connection.start({ jsonp: true }).done((data: any) => {  
        console.log('Now connected ' + data.transport.name + ', connection ID= ' + data.id);  
        this.connectionEstablished.emit(true);  
        this.connectionExists = true;  
    }).fail((error: any) => {  
        console.log('Could not connect ' + error);  
        this.connectionEstablished.emit(false);  
    });  
}  

这是控制台中的错误

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获取401（未经授权）

这里有人帮我吗