The SignalR interferes with the another controller - asp.net-core

Question

As soon as I connect the SignalR to the application using Install-package Microsoft.AspNetCore.SignalR immediately stops working the POST method of one of the controllers. Without a signal, all works fine. Startup.cs:
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<ApplicationDbContext>(options => options.UseMySql(configuration.GetConnectionString("DefaultConnection")));
var section = configuration.GetSection("AppSettings");
var settings = section.Get<AppSettings>();
services.Configure<AppSettings>(section);
var builder = services.AddIdentityCore<ApplicationUser>(user =>
{
user.Password.RequireDigit = true;
user.Password.RequireLowercase = false;
user.Password.RequireUppercase = false;
user.Password.RequireNonAlphanumeric = false;
user.Password.RequiredLength = 6;
});
builder = new IdentityBuilder(builder.UserType, typeof(IdentityRole), builder.Services);
builder.AddSignInManager<SignInManager<ApplicationUser>>();
builder.AddRoleValidator<RoleValidator<IdentityRole>>();
builder.AddRoleManager<RoleManager<IdentityRole>>();
builder.AddEntityFrameworkStores<ApplicationDbContext>();
builder.AddDefaultTokenProviders();
services.AddCors(options => options.AddPolicy("CorsPolicy", policy =>
{
policy
.AllowAnyMethod()
.AllowAnyHeader()
.AllowAnyOrigin()
.AllowCredentials();
}));
services.AddSignalR();
services.AddOData();
services.AddMvc();
services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
.AddJwtBearer(options =>
{
options.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuer = true,
ValidateAudience = true,
ValidateLifetime = true,
ValidateIssuerSigningKey = true,
ValidIssuer = settings.issuer,
ValidAudience = settings.issuer,
IssuerSigningKey = JwtSecurityKey.Create(settings.key)
};
options.Events = new JwtBearerEvents
{
OnMessageReceived = context =>
{
if (context.Request.Path.Value.StartsWith("/chatHub") &&
context.Request.Query.TryGetValue("token", out StringValues token)
)
{
context.Token = token;
}
return Task.CompletedTask;
},
OnAuthenticationFailed = context =>
{
Console.WriteLine("OnAuthenticationFailed: " + context.Exception.Message);
return Task.CompletedTask;
},
OnTokenValidated = context =>
{
Console.WriteLine("OnTokenValidated: " + context.SecurityToken);
return Task.CompletedTask;
}
};
});
services.AddAuthorization(options =>
{
options.AddPolicy("user", policy => policy.RequireClaim("id"));
});
services.AddSingleton<ISendGridClient, SendGridClient>(serviceProvider =>
{
return new SendGridClient(settings.sendGridKey);
});
services.AddSingleton<ILogger>(serviceProvider =>
{
return loggerFactory.CreateLogger("logger");
});
services.AddSingleton<IEmailSender, EmailSender>();
services.AddSingleton<IUploader, Uploader>();
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseBrowserLink();
app.UseDeveloperExceptionPage();
app.UseDatabaseErrorPage();
}
else
{
app.UseExceptionHandler("/Error");
}
app.UseStaticFiles();
app.UseAuthentication();
app.UseCors("CorsPolicy");
app.UseSignalR(routes =>
{
routes.MapHub<SignalRHub>("/chatHub");
});
app.UseMvc(routebuilder =>
{
routebuilder.MapRoute(name: "DefaultApi", template: "api/{controller=Home}/{action=Index}/{id?}");
});
}
Controller:
[Authorize(Policy = "user")]
public class UserFilesController : Controller
{
[HttpPost]
public async Task<IActionResult> SaveAvatar(AvatarModel avatar)
{
// Some code here, here the call does not even come
}
}
Calling in JavaScript
$.ajax({
method: 'POST',
url: serviceUrl + 'api/userfiles/saveavatar',
data: data,
headers: getHeaders()
}).done(function (UploadResult) {
// some code here
});