I am getting the following error message:

Error: Connection disconnected with error 'Error: Server returned an error on close: Connection closed with an error. InvalidDataException: The maximum message size of 36000B was exceeded. The message size can be configured in AddHubOptions.'.
Uncaught Error Error: Server returned an error on close: Connection closed with an error. InvalidDataException: The maximum message size of 36000B was exceeded. The message size can be configured in AddHubOptions.

Astute readers will notice that I already increased the maximum message size. I could increase it again, but that does not fix the problem. I want to know why the message is so large in the first place.

However I cannot track down exactly which message is triggering this message. In Chrome dev tools I can see the error in binary but not what caused it. I enabled more logging and that also gives me the error but not the source of the error.

How do I see exactly what is causing this large message?

CodePudding user response：

How do I see exactly what is causing this large message?

You can network trace by the way:

Collect a network trace with Fiddler
Install it from

For more info you can refer to Network traces

You can trace your web socket by wireshark too. It's a sample video.

but that does not fix the problem Please

Please also try the following codes:

services.AddSignalR(o => {
                    o.MaximumReceiveMessageSize = null; // no limit
                    o.EnableDetailedErrors = true;
                }).AddMessagePackProtocol();


services.Configure<HubOptions>(options =>
{
    options.MaximumReceiveMessageSize = null;
});




public void Configure(IApplicationBuilder app, IHostEnvironment env)
{
    ....
    app.UseRouting();
    app.UseAuthorization();

     app.UseEndpoints(routes => {
     
        routes.MapHub<ChatHub>("/chatHub", options =>
        {
            options.ApplicationMaxBufferSize = 1024000;
            // Set to 0 for no limit, or to some non-zero value (in bytes) to set a different buffer limit
            options.TransportMaxBufferSize = 0;
        });
    });
    
    app.UseMvc();
    ....
}