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Answer

SingalR Angular Error 404

osyris zosar

osyris zosar
2y
1.7k
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I am trying to get SignalR running on Angular.
I have achived this before with ReactJs

Looking at several Forum topics and articles I cant really get it to work:

Error Code that i get:

Utils.js:149 [2022-04-24T03:47:55.451Z] Error: Failed to start the connection: Error: Failed to complete negotiation with the server: Error: <!DOCTYPE html>
<pre>Cannot POST /Chat/negotiate</pre>
: Status code '404' Either this is not a SignalR endpoint or there is a proxy blocking the connection.

 

Code

Program.cs:

//Code...
    
 builder.Services.AddCors(options =>
 {
     options.AddPolicy(name: "Angular",
         builder =>
         {
             builder.WithOrigins("localhost:44376", "localhost:7231")
             .AllowAnyMethod()
             .AllowAnyHeader()
             .AllowAnyOrigin();
         });
 });
    
 // Code...
    
    
 app.MapControllerRoute(
     name: "default",
     pattern: "{controller}/{action=Index}/{id?}");
    
 app.MapFallbackToFile("index.html"); ;
    
 app.MapHub<ChatHub>("Chat");
    
 app.Run();

ChatHub.cs:

using Microsoft.AspNetCore.SignalR;
    
 namespace DeliveryRestaurant.Hubs
 {
     public class ChatHub : Hub
     {
         public async Task SendAll(string message)
         {
    
             await Clients.All.SendAsync("ReceiveAllMessage", message);
         }

Angular Ts:

ngOnInit(): void {
        
       let connection = new signalR.HubConnectionBuilder()
       .withUrl("Chat")
       .build();
     connection.on("ReceiveAllMessage", data => {
       console.log("REceived Data", data);
     });
     connection.start()
       .then(() => connection.invoke("ReceiveAllMessage", "Hello"));
         }  }
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