It's like JSON.

but fast and small.

is an efficient binary serialization format. It lets you exchange data among multiple languages like JSON. But it's faster and smaller. Small integers are encoded into a single byte, and typical short strings require only one extra byte in addition to the strings themselves.

默认我们在 ASP.NET Core SignalR 中使用 WebSocket 协议通信，默认使用 JSON 格式数据传输，为了更高效我们可以使用 MessagePack 来替换。 MessagePack 是一个高效的二进制序列化格式。它让你像JSON一样可以在各种语言之间交换数据。但是它比JSON更快、更小。小的整数会被编码成一个字节，短的字符串仅仅只需要比它的长度多一字节的大小。

在 SignalR 中使用 MessagePack 也很简单：

public void ConfigureServices(IServiceCollection services)        {            //自定义配置            services.Configure
     
      (Configuration.GetSection("ConnectionStrings"));            //https://docs.microsoft.com/en-us/aspnet/core/security/gdpr?view=aspnetcore-2.1            services.Configure
      
       (options =>            {                options.CheckConsentNeeded = context => true;                options.MinimumSameSitePolicy = SameSiteMode.None;            });            //添加 Hangfire 服务            services.AddHangfire(config => config.UseRedisStorage(Redis));            // services.AddHangfire(config => config.UseSqlServerStorage("
       
        "));            //添加 Cookie 中间件            services.AddAuthentication(sharedOptions =>            {                sharedOptions.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;                // sharedOptions.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;            })            //.AddAzureAdB2C(opts => Configuration.Bind("AzureAdB2C", opts))            .AddCookie(opts =>            {                opts.LoginPath = new PathString("/account/login");                opts.AccessDeniedPath = new PathString("/account/denied");            });            services.AddSignalR(options =>            {                //Faster pings for testing                //options.KeepAliveInterval = TimeSpan.FromSeconds(5);            })            .AddMessagePackProtocol(options =>            {               // options.FormatterResolvers = new List
        
         ()                //{                 //   MessagePack.Resolvers.StandardResolver.Instance                //};            })            .AddRedis(Configuration.GetConnectionString("Redis"));            //返回大小写问题            services.AddMvc()                    .AddJsonOptions(option => option.SerializerSettings.ContractResolver = new Newtonsoft.Json.Serialization.DefaultContractResolver());        }
        
       
      
     

.NET 客户端

var hubConnection = new HubConnectionBuilder()                        .WithUrl("/chatHub")                        .AddMessagePackProtocol()                        .Build();

JavaScript 客户端

npm install @aspnet/signalr-protocol-msgpack

const connection = new signalR.HubConnectionBuilder()                              .withUrl("/hqHub")                              .withHubProtocol(new signalR.protocols.msgpack.MessagePackHubProtocol())                              .build();

运行日志

REFER: