具有ASP.NET核心的SignalR不使用websockets，而是使用长轮询

services.AddSignalR()
    .AddJsonProtocol(options =>
    {
        options.PayloadSerializerOptions.PropertyNamingPolicy = null;
    })
    .AddMessagePackProtocol()
    .AddAzureSignalR()
    .AddStackExchangeRedis(options =>
    {
        options.Configuration = "redis-connection-string";
    })
    .AddAzureSignalR(options =>
    {
        options.ConnectionString = "azure-signalr-connection-string";
    })
    .AddAzureSignalR(options =>
    {
        options.AccessTokenProvider = (request) =>
        {
            // 自定义访问令牌提供程序
            return Task.FromResult("access-token");
        };
    })
    .AddAzureSignalR(options =>
    {
        options.ClaimsProvider = (request) =>
        {
            // 自定义声明提供程序
            return new[]
            {
                new Claim(ClaimTypes.NameIdentifier, "user-id"),
                new Claim(ClaimTypes.Name, "user-name")
            };
        };
    });