SignalR .Net Core 3.1 Web 应用程序在本地 IIS 上不起作用

Question

尝试使用 ASP.Net Core 3.1和Angular基于在线示例创建聊天。

以下内容在 IIS Express 上非常有效，但在本地 IIS 上则不然。

错误信息： WebSocketTransport.js：85 WebSocket 连接到"ws://localhost/MyCoreAPI/ChatHub"失败：WebSocket 握手期间出错：意外响应代码：400

启动：

public void ConfigureServices(IServiceCollection services)
{ 
services.AddSignalR();
}
public void Configure(IApplicationBuilder app, 
IWebHostEnvironment env, 
ApplicationDbContext context)
{
app.UseCors("EnableCORS");
app.UseMiddleware<ErrorHandlingMiddleware>();
app.UseMiddleware<TokenServiceMiddleware>();
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(route =>
{
route.MapHub<ChatHub>("/ChatHub");
});
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=auth}/{action}/");
});

app.Run(async (c) =>
{
await c.Response.WriteAsync("My Core Web API");
});
}

聊天中心：

public class ChatHub : Hub
{
public Task SendMessageToAll(Message message) =>
Clients.All.SendAsync("receiveMessage", message);
}

客户：

export class ChatService {
receiveMessage = new EventEmitter<Message>();  
connectionEstablished = new EventEmitter<Boolean>();  
private connectionIsEstablished = false;  
private _hubConnection: HubConnection;  
constructor() {  
this.createConnection();  
this.registerOnServerEvents();  
this.startConnection();  
}  
async sendMessage(message: Message) {  
console.log(message);
await this._hubConnection.invoke('SendMessageToAll', message);  
}  
private createConnection() {  
this._hubConnection = new HubConnectionBuilder()
.configureLogging(LogLevel.Debug)  
.withUrl('http://localhost/MyCoreAPI/ChatHub', {
skipNegotiation:true,
transport:HttpTransportType.WebSockets
})  
.build();  
}  
private startConnection(): void {  
this._hubConnection  
.start()  
.then(() => {  
this.connectionIsEstablished = true;  
console.log('Hub connection started');  
this.connectionEstablished.emit(true);  
})  
.catch(err => {  
console.log('Error while establishing connection, retrying...');  
setTimeout(function () { this.startConnection(); }, 5000);  
});  
}  
private registerOnServerEvents(): void {  
this._hubConnection.on('receiveMessage', (data: any) => {
console.log(data);  
this.receiveMessage.emit(data);  
});  
}
}

}  

在IIS Express上使用"http://localhost:59235/ChatHub"一切正常。当我使用"http://localhost/MyCoreAPI/ChatHub"切换到本地IIS时，出现错误。

Answer 1

你能检查一下IIS中是否启用了WebSockets协议吗？

"打开或关闭 Windows 功能" -> 互联网信息服务 ->万维网服务 -> 应用程序开发功能 -> WebSocket 协议