Error failed to complete negotiation with the server error

constructor(props) {
    super(props);
    
    this.state = {
      nick: '',
      message: '',
      messages: [],
      hubConnection: null,
    };
  }

  componentDidMount = () => {
    const nick = window.prompt('Your name:', 'John');

    let hubConnection = new signalR.HubConnectionBuilder()
    .withUrl("https:/######################.#######.#####.net",
    {accessTokenFactory: () => #####################################' })
    .configureLogging(signalR.LogLevel.Trace)
     .build();
     
    this.setState({ hubConnection, nick }, () => {  
      this.state.hubConnection
        .start()
        .then(() => console.log('Connection started!'))
        .catch(err => console.log('Error while establishing connection :('));

      this.state.hubConnection.on('sendToAll', (nick, receivedMessage) => {
        const text = `${nick}: ${receivedMessage}`;
        const messages = this.state.messages.concat([text]);
        this.setState({ messages });
      });
    });
  }
  sendMessage = () => {
    this.state.hubConnection
      .invoke('sendToAll', this.state.nick, this.state.message)
      .catch(err => console.error(err));
  
      this.setState({message: ''});      
  };

render() {
    return(
        <>
            <div>
                Hiiiii
            </div>
            <div>
                <br />
                <input
                    type="text"
                    value={this.state.message}
                    onChange={e => this.setState({ message: e.target.value })}
                />

                <button onClick={this.sendMessage}>Send</button>

                <div>
                    {this.state.messages.map((message, index) => (
                    <span style={{display: 'block'}} key={index}> {message} </span>
                    ))}
                </div>
            </div>
        </>
    );}

Содержание

1. React Native app won’t complete negotiation with SignalR Core
2. 2 Answers 2
3. Linked
4. Related
5. Hot Network Questions
6. Subscribe to RSS
7. Rijwan & Satya’s Blog
8. Resolve: SignalR Error: Failed to complete negotiation with the server
9. By Satya Karki
10. Angular/SignalR Error: Failed to complete negotiation with the server
11. 8 Answers 8
12. .NET Core SignalR, Тайм-аут сервера / проблема переподключения
13. 3 ответа
14. SignalR connection to Azure not working (.net core 3.1)
15. 1 Answer 1

Add Answer
|
View In TPC Matrix

Technical Problem Cluster First Answered On
April 26, 2022

Popularity
5/10

Helpfulness
4/10

Contributions From The Grepper Developer Community

Contents

Code Examples

Related Problems

TPC Matrix View Full Screen

SignalR workaround to get client data from server

I know that SignalR can't have a return from client when invokation came from the server. On the github repository of SignalR I asked for a workaround (https://github.com/aspnet/SignalR/issues/1329) and they suggest me to get the result by sending it from the client to server to another method in the hub and so use TaskCompletionSource and some connection metadata to catch the result, but I'm stuck on how to do this
Controller Server :
[HttpPut("send/{message}")]
public async Task<IActionResult> SendMessage(string message)
{
if (!ModelState.IsValid) return BadRequest(ModelState.Values);
string connectionId = Request.Headers["connectionId"];
await _chatHubContext.Clients.Client(connectionId).InvokeAsync("send");
// Catch the call of MessageReceived and get the chat status
return new OkObjectResult(new EmptyJsonResult() { Result = "OK" });
}
Hub Server
public class ChatHub : Hub
{
public Task MessageReceive(bool chatStatus)
{
// Tell controller that message is received
}
}
Angular 4 client
import { Component, Inject } from '#angular/core';
import { HubConnection } from '#aspnet/signalr-client';
#Component({
selector: 'chat',
templateUrl: './chat.component.html',
styleUrls: ['./chat.component.css']
})
/** chat component*/
export class ChatComponent {
hubConnection: HubConnection;
chatStatus = false;
/** chat ctor */
constructor( #Inject('BASE_URL') private originUrl: string) {
this.hubConnection = new HubConnection(`${this.originUrl}chat`);
setInterval(() => {
this.chatStatus = !this.chatStatus;
},
5000);
this.hubConnection
.start()
.then(() => {
this.hubConnection.on('send', (message: string) => {
if (this.chatStatus) {
//send message
}
this.hubConnection
.invoke('messageReceived', this.chatStatus);
});
});
}
}
As you can see on this code, I don't know what to do in the controller method and the Hub method to know that the method MessageReceive was called and to get his return to send it back to the controller request.

"with a little hacking around with connection metadata and TaskCompletionSource you could also probably make it look a lot like a method invocation returning a value."
Controller server:
Inject HttpConnectionManager.
// using Microsoft.AspNetCore.Http.Connections.Internal;
public async Task<IActionResult> SendMessage(string message)
{
string connectionId = Request.Headers["connectionId"];
var chatStatus = await Send(connectionId, message);
return new OkObjectResult(new { Result = "OK", ChatStatus = chatStatus });
}
private async Task<bool> Send(string connectionId, string message)
{
var tcs = new TaskCompletionSource<bool>();
_connectionManager.TryGetConnection(connectionId, out HttpConnectionContext connection);
connection.Items.Add("tcs", tcs);
await _chatHubContext.Clients.Client(connectionId).SendAsync("send", message);
var chatStatus = await tcs.Task;
connection.Items.Remove("tcs");
return chatStatus;
}
Hub server:
public Task MessageReceived(bool chatStatus)
{
Context.Items.TryGetValue("tcs", out object obj);
var tcs = (TaskCompletionSource<bool>)obj;
tcs.SetResult(chatStatus);
return Task.CompletedTask;
}
Angular 4 client:
// No change

Error:- method not found while connecting signalr

having error with signalr. On running application it is showing error "method not found".
having problem in connection.
I'm using signalr for chatting purpose. The project is in Reactjs and asp.net core.
react app is created through creat-react-app (console).
// code in reactjs*****
import React, { Component } from 'react';
import { HubConnection } from 'signalr-client-react';
class SingnalR extends Component {
constructor(props) {
super(props);
this.state = {
bookingMessage: '',
bookingHubConnection: null
};
}
componentDidMount() {
const bookingHubConnection = new HubConnection('http://localhost:5000/chatHub')
this.setState({ bookingHubConnection }, () => {
this.state.bookingHubConnection.start()
.then(() => console.log('Signalr started '))
.catch((err) => console.log('Error connecting signalr - ' + err));
this.state.bookingHubConnection.on('booking', (message) => {
const bookingMessage = message;
this.setState({ bookingMessage });
});
});
}
render() {
return (
<div>
<div>message from server {this.state.bookingMessage}</div>
userName <input id="userName" />
userMessage<input id="userMessage" />
<button id = "sendMessage"> sendMessage</button>
</div>
)
}
}
export default SingnalR;
//code for asp.net core*******
//code chatHub
using Microsoft.AspNetCore.SignalR;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace TinyHouseApi.SignalR
{
public class ChatHub:Hub
{
public async Task SendMessage(string user, string message)
{
await Clients.All.SendAsync("ReceiveMesage", user, message);
}
}
}
//code of Startupfile
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddCors();
services.AddDbContext<DataContext>(options => options.UseSqlServer(Configuration.GetConnectionString("testDB")));
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services.AddAutoMapper();
//configure SignalR
services.AddSignalR();
// configure strongly typed settings objects
var appSettingsSection = Configuration.GetSection("AppSettings");
services.Configure<AppSettings>(appSettingsSection);
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
// global cors policy
app.UseCors(x => x
.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyHeader());
app.UseAuthentication();
app.UseMvc();
//SignalR
app.UseSignalR(routes =>
{
routes.MapHub<ChatHub>("/chatHub");
});
}
}

You use signalr-client-react witch depends on ms-signalr-client witch depends on jquery.signalR.js witch is the old version of signalR client and not compatible with ASP.Net Core SignalR.
To use the latest SignalR version wit ASP.Net Core you should use #aspnet/signalr package. You cannot use signalr-client-react
There is a tutorial here

SignalR/Angular: Failed to load“url”.Response to preflight request doesn’t pass access control check.

I am trying to implement a simple notification system using SignalR for my server, and Angular for my client. When I run my angular application after starting my server, I receive this error:
Failed to load http://localhost:1874/notify/negotiate: Response to
preflight request doesn't pass access control check: The value of the 'Access-
Control-Allow-Credentials' header in the response is '' which must be 'true'
when the request's credentials mode is 'include'. Origin 'http://localhost:4200'
is therefore not allowed access. The credentials mode of
requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.
I believe this may have something to do with cors? My server is just sending notifications and my client is displaying them. That is it. Right at the start up, my application is unable to connect to the server. Here is my startup.cs
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
namespace SignalRHub
{
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddCors(o => o.AddPolicy("CorsPolicy", builder =>
{
builder
.AllowAnyMethod()
.AllowAnyHeader()
.WithOrigins("http://localhost:4200");
}));
services.AddSignalR();
services.AddMvc();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseCors("CorsPolicy");
app.UseSignalR(routes =>
{
routes.MapHub<NotifyHub>("/notify");
});
app.UseMvc();
}
}
}
And here is my Angular Component class:
import { Component, OnInit } from '#angular/core';
import { HubConnection, HubConnectionBuilder } from '#aspnet/signalr';
import { Message } from 'primeng/api';
#Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
private _hubConnection: HubConnection;
msgs: Message[] = [];
constructor() { }
ngOnInit(): void {
this._hubConnection = new HubConnectionBuilder().withUrl('http://localhost:1874/notify').build();
this._hubConnection
.start()
.then(() => console.log('Connection started!'))
.catch(err => console.log('Error while establishing connection :('));
this._hubConnection.on('BroadcastMessage', (type: string, payload: string) => {
this.msgs.push({ severity: type, summary: payload });
});
}
}
Here is the github where I am following the tutorial from.
https://github.com/rukshandangalla/Angular5-SignalR-Notifications
Thank you.

You will also need to allow credentials.
To do so, change ConfigureServices, and add .AllowCredentials() like so:
public void ConfigureServices(IServiceCollection services)
{
services.AddCors(o => o.AddPolicy("CorsPolicy", builder =>
{
builder
.AllowAnyMethod()
.AllowAnyHeader()
.AllowCredentials()
.WithOrigins("http://localhost:4200");
}));
services.AddSignalR();
services.AddMvc();
}

Error when accessing ASP.NET Core WebApi from Ionic

I have some issues with calling my ASP.NET Core WebAPI from my Ionic app.
I can see in the developer tools that the data get’s loaded correctly, but Ionic is giving me an error:
error message from Ionic:
data loaded from the api:
CORS is enabled in the api:
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
services.AddCors();
services.AddDbContext<TodoContext>(opt =>
opt.UseInMemoryDatabase("TodoList"));
services.AddMvc()
.SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
}
public void Configure(IApplicationBuilder app)
{
app.UseCors(builder => builder.WithOrigins("http://localhost"));
app.UseMvc();
}
}
I think the error is caused by Ionic or Angular. When I’m loading the data from a public api, everything works fine. I’ve also tried accessing the api with ssl and without.
When you have any questions, feel free to ask me in the comments.
Edit
This is how I call the api:
#Injectable()
export class RestProvider {
apiUrl = 'https://localhost:5001/api';
constructor(public http: HttpClient) { }
getTodoItems() {
return new Promise(resolve => {
this.http.get(this.apiUrl + '/todo').subscribe(data => {
resolve(data);
}, err => {
console.log(err);
});
});
}
}
and this is my controller:
[Route("api/[controller]")]
[ApiController]
public class TodoController : ControllerBase
{
private readonly TodoContext _context;
public TodoController(TodoContext context)
{
_context = context;
if (_context.TodoItems.Count() == 0)
{
_context.TodoItems.Add(new TodoItem { Title = "Item1" });
_context.TodoItems.Add(new TodoItem { Title = "Item2" });
_context.SaveChanges();
}
}
[HttpGet]
public ActionResult<List<TodoItem>> GetAll()
{
return _context.TodoItems.ToList();
}
}

fixed it by adding the port number:
public void Configure(IApplicationBuilder app)
{
app.UseCors(builder => builder.WithOrigins("http://localhost:8100").AllowAnyMethod());
app.UseMvc();
}

You can use the ionic.config.json file to configure a proxy in your app:
{
"name": "proxy-example",
"app_id": "",
"proxies": [
{
"path": "/api",
"proxyUrl": "http://cors.api.com/api"
}
]
}
Then when doing the http call:
httpClient.get(proxyHost + '/api');
More info Ionic Blog

Angular 5 Post API Call

I am very new to Angular , Developing an app in Angular 5 . I am trying to post some data to an API , below is my code
.Net Core Web API
[Produces("application/json")]
[Route("api/Audit")]
public class AuditController : Controller
{
private IConfiguration _configuration;
private CommomUtility util;
private Login Login;
public AuditController(IConfiguration configuration)
{
_configuration = configuration;
util = new CommomUtility(configuration);
Login = new Login(configuration);
}
[HttpPost]
public JsonResult Action([FromBody] List<Dictionary<string, string>> li)
{
DataTable dt = new DataTable();
string jsonString = string.Empty;
try
{
if (li[0]["ActionMethod"].Equals("CheckLogin", StringComparison.InvariantCultureIgnoreCase))
{
dt = Login.checkLogin(li);
}
}
catch (Exception ex)
{
}
finally
{
dt.TableName = "Result";
jsonString = util.DataTableToJson(dt);
}
return Json(JObject.Parse(jsonString));
}
}
Angular Login Componenet
import { Component, OnInit } from '#angular/core';
import { HttpClient,HttpClientModule,HttpParams,HttpHeaders } from '#angular/common/http';
#Component({
selector: 'app-login',
templateUrl: './login.component.html',
styleUrls: ['./login.component.css']
})
export class LoginComponent implements OnInit {
username: string="";
password: string="";
loginBtnText: string='Log In';
clearBtnText: string='Reset Fields';
message:string;
cssClass:string;
constructor(private http:HttpClient ) { }
ngOnInit() {
}
checkLogIn(){
const params = new HttpParams();
params.set('ActionMethod', 'CheckLogin');
params.set('StaffCode', '15989');
params.set('Password', '#####');
var queryHeaders = new HttpHeaders();
queryHeaders.append('Content-Type', 'application/json');
debugger
var v= this.http.post("http://localhost:57863/api/Audit/",
params,{ headers: queryHeaders}
)
.subscribe(data =>
{alert('ok');},
error =>
{alert("Error");}
);
}
clearFields(){
this.username="";
this.password="";
this.message="";
}
}
I am invoking checkLogIn() on button click , after invoking this API it reach to constructor of API class only but does not go inside API Method.
I checked my browser Network tab and it show
415 Unsupported Media Type
When I invoking the Get API (values api) which is by default comes in .Net Core Web API template than it works and show alert OK but failed in case of POST
Update 1

Seems like you have mentioned application/json in web API as Produces("application/json") but not passing it in header from the angular code.
Try this
import { HttpClient, HttpHeaders,HttpParams} from '#angular/common/http';
if can't change the web api then change angular code as show below and keep the web api as it is.
angular
checkLogIn(){
var requestData=[];
var params={
"ActionMethod":"CheckLogin",
"StaffCode":"15989",
"Password":"####"
}
requestData.push(params);
const httpOptions = {
headers: new HttpHeaders({
'Content-Type': 'application/json'
})
};
//pass it if you can't modify web api
var v= this.http.post("http://localhost:5000/api/Audit/",
requestData,httpOptions
)
.subscribe(data =>
{alert('ok');},
error =>
{alert("Error");}
);
}
if you can change web api then,
angular
checkLogIn(){
var requestData=[];
var params={
"ActionMethod":"CheckLogin",
"StaffCode":"15989",
"Password":"####"
}
const httpOptions = {
headers: new HttpHeaders({
'Content-Type': 'application/json'
})
};
//pass it like this if you can change web api
var v= this.http.post("http://localhost:5000/api/Audit/",
params,httpOptions
)
.subscribe(data =>
{alert('ok');},
error =>
{alert("Error");}
);
}
web api controller
public class LoginContract
{
public string ActionMethod { get; set; }
public string StaffCode { get; set; }
public string Password { get; set; }
}
[HttpPost]
public JsonResult Action([FromBody] LoginContract li)
{
DataTable dt = new DataTable();
string jsonString = string.Empty;
try
{
if (li.ActionMethod.Equals("CheckLogin", StringComparison.InvariantCultureIgnoreCase))
{
dt = Login.checkLogin(li);
}
}
catch (Exception ex)
{
Console.Write(ex);
}
finally
{
dt.TableName = "Result";
jsonString = util.DataTableToJson(dt);
}
return Json(JObject.Parse(jsonString));
}
I think you haven't enabled the Cors Module in your web api. add the following code to Startup.cs of your web api.
If you haven't install the CORS nuget package
Install-Package Microsoft.AspNetCore.Cors
Add the code inside ConfigureServices method.
services.AddCors(options =>
{
options.AddPolicy("AllowAll",
builder =>
{
builder
.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyHeader()
.AllowCredentials();
});
});
Now in Configure method add the following code before app.UseMvc().
app.UseCors("AllowAll");
I hope this will fix your problem. If you have any issues or doubt let me know.

Error 415 Unsupported media type Saying that the value of request header content-type is not what server is expecting in the request. Try to set content-type header to value application/json in angular.

The content-type seems to be wrong. You can try to send a JSON object as the payload directly.
`
const payload =
{'ActionMethod': 'CheckLogin',
'StaffCode': '15989',
'Password': 'a$a#'
}
var v= this.http.post("http://localhost:57863/api/Audit/",payload)`

You are facing COARS errors problem very famous
as u invoking another processes link hitting so causes dont panic
Do
webapiconfig.cs
var cors = new System.Web.Http.Cors.EnableCorsAttribute("http://localhost:51156",
"*", "*");
config.EnableCors(cors);
// ADD JUST THIS LINE TO REGISTER FOLLOWING CLASS.
config.Formatters.Add(new BrowserJsonFormatter());
now add following code to ovverride
// TO SEE DATA IN JSON IN CHROME BROWSER ADD FOLLOWING CLASS BrowserJsonFormatter and REGISTER IN METHOD ADD NEW OBJECT OF THIS CLASS.
public class BrowserJsonFormatter : System.Net.Http.Formatting.JsonMediaTypeFormatter
{
public BrowserJsonFormatter()
{
this.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
this.SerializerSettings.Formatting = Formatting.Indented;
}
public override void SetDefaultContentHeaders(Type type, HttpContentHeaders headers, MediaTypeHeaderValue mediaType)
{
base.SetDefaultContentHeaders(type, headers, mediaType);
headers.ContentType = new MediaTypeHeaderValue("application/json");
}
}
//-----------------------------------------------------------------------------------------------------------------------

• Remove From My Forums

• Question

• Hi All, 

  My Lync federation to Lync Online users has stopped working. My edge server has the following Error in the event logs:

  Error
  Event ID: 14428
  TLS outgoing connection failures.
  
  Over the past 12 minutes, Lync Server has experienced TLS outgoing connection failures 15 time(s). The error code of the last failure is 0x80072746 while trying to connect to the server "sipfed.online.lync.com" at address [66.119.157.212:5061], and the display name in the peer certificate is "sipfed.online.lync.com".
  Cause: Most often a problem with the peer certificate or perhaps the host name (DNS) record used to reach the peer server. Target principal name is incorrect means that the peer certificate does not contain the name that the local server used to connect. Certificate root not trusted error means that the peer certificate was issued by a remote CA that is not trusted by the local machine.
  Resolution:
  Check that the address and port matches the FQDN used to connect, and that the peer certificate contains this FQDN somewhere in its subject or SAN fields. If the FQDN refers to a DNS load balanced pool then check that all addresses returned by DNS refer to a server in the same pool. For untrusted root errors, ensure that the remote CA certificate chain is installed locally. If you have already installed the remote CA certificate chain, then try rebooting the local machine.

  and the following from the SipStack trace:

  TL_ERROR(TF_CONNECTION) [0]0A38.0C58::05/07/2015-00:10:11.840.00018488 (SIPStack,SIPAdminLog::WriteConnectionEvent:SIPAdminLog.cpp(460))[3093861427] 
  $$begin_record
  Severity: error
  Text: Connection was closed because a send operation failed
  Local-IP: 103.5.28.177:49165
  Peer-IP: 66.119.157.212:5061
  Peer: sipfed.online.lync.com:5061
  Connection-ID: 0x1201
  Transport: M-TLS
  Result-Code: 0x80072746
  Data: fqdn="sipfed.online.lync.com:5061";ip-address="66.119.157.212";peer-type="FederatedPartner";winsock-code="10054";winsock-info="The peer forced closure of the connection"
  $$end_record

  My certificate is valid and current (DigiCert) so I have no idea what is going wrong. Any help appreciated

  ---

  Thanks Christoph