Blazor-browser connection disconnected, While upload the file above 1MB

[Gopigovin]

Bug Description

I have upload the file more than 1MB into file uploader and i have facing browser server disconnected issue. please find the error details.

27T11:52:11.361Z] Error: Connection disconnected with error 'Error: Server returned an error on close: Connection closed with an error.'.
e.log @ blazor.server.js:1

DOTNET Info

.NET Core SDK (reflecting any global.json):
 Version:   3.0.100-preview6-012264
 Commit:    be3f0c1a03

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.17763
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\3.0.100-preview6-012264\

Host (useful for support):
  Version: 3.0.0-preview6-27804-01
  Commit:  fdf81c6faf

.NET Core SDKs installed:
  1.1.13 [C:\Program Files\dotnet\sdk]
  2.1.202 [C:\Program Files\dotnet\sdk]
  2.1.505 [C:\Program Files\dotnet\sdk]
  2.1.602 [C:\Program Files\dotnet\sdk]
  2.1.604 [C:\Program Files\dotnet\sdk]
  2.1.700-preview-009618 [C:\Program Files\dotnet\sdk]
  2.1.700 [C:\Program Files\dotnet\sdk]
  2.1.800-preview-009677 [C:\Program Files\dotnet\sdk]
  2.1.800-preview-009696 [C:\Program Files\dotnet\sdk]
  3.0.100-preview6-012264 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.0.0-preview6.19307.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 1.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.0-preview6-27804-01 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.0.0-preview6-27804-01 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

Regards,
Gopi G.

[dcarr42]

Generally allocating large buffers is not a good idea but the defaults can be overridden.

https://docs.microsoft.com/en-us/aspnet/core/signalr/security?view=aspnetcore-2.1#buffer-management

[Gopigovin]

Hi @DAllanCarr ,

Thanks for your update,

I have resolved the issue while increase the buffer size in startup.cs page. But this is not working in client side project.

services.AddSignalR(e => {
                e.MaximumReceiveMessageSize = 102400000;
            });

Any other way to resolve the issue, without increase buffer size into startup.cs page ?

Regards,
Gopi G.

[dcarr42]

Nulling this property will get around the artificial limit. But to be honest consider reducing message size which I understand may not be possible.

[mkArtakMSFT]

Thanks for helping out here, folks.
Looks like the original question is answered, so we're closing this issue now.

[BrennanConroy]

You can take a look at streaming and split the files into multiple payloads then stitch them back together on the other end
https://docs.microsoft.com/en-us/aspnet/core/signalr/streaming?view=aspnetcore-2.2
Note: You will need to split the file yourself, streaming will not split the payload for you.