Signalr | Gradle compatible compiled version of Microsoft Signalr

I am building a Tizen App (.NET Tizen 4.0) using .NET Core and Xamarin (https://docs.tizen.org/application/dotnet/).

Everything works perfectly fine, except for one thing. It is impossible to start an SignalR (Microsoft.AspNetCore.SignalR.Client (5.0.7)) connection to a hub. As soon as I create a new HubConnectionBuilder the following exception gets thrown:

System.IO.FileLoadException: Could not load file or assembly 'System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

The weirdest part about this. This exception changes without me doing anything. If I grab a drink for example, come back and run it again a different assembly is missing. For now I saw either System.Threading.Tasks.Extensions, Version=4.2.0.1 or Microsoft.Extensions.DependencyInjection.Abstractions, Version=5.0.0 missing. To top it off: I do not use either of those packages actively.

So basically, as soon as I remove the following line of code, everything works fine.

I'm using SignalR on ASP.NET Core 5 web server for Android device management. I can send messages from device (D2C), and receive messages with String parameters (C2D). But I can't receive messages with custom object parameters, the handler receives all object members as null. I develop an WPF client and it receives this object well.

I'm following ASP.NET Core SignalR Java client documentation. It explains how to use custom objects in Passing Class information in Java section.

In build.gradle file:

How can I send events from an external js file to Vue components? i use signalR in external file and i want to get data when come from api runtime but when get data can't send it to vue

this is js file :

I'm currently trying to build an app that involves SignalR's hub connection functionality. Eventually, I want to enable the app to handle real-time chats, but first I want to check if the basic part of SignalR works.

I'm trying to ensure that a toastr that notifies about the hub connection is displayed when a user logs in, but the problem is that the toastr is not displayed. Here are some pieces of my code.

[PresenceHub.cs]

I am trying to setup a vue3 app with i18n localization. The localization is supposed to be located in json files. I added i18n via vue add i18n to my project. The questions asked during installation were all answered with the default value except the one with the legacy support (my answer: no). When i try to use a text from a json file, it will tell me in the console [intlify] Not found 'message' key in 'en' locale messages. The local translations work just fine. And i have no clue why it is not working with the translations provided in the JSON file.

Here is my code:

packages.json

I have data and I want to present it to a user without him needing to refresh the page. I am using Asp .net core SignalR like this:

I am trying to implement SignalR in a Dotnet Core + ReachtJS web application. While calling the API and making a SignalR connection, I am facing a CORS issue.

ReactJS SignalR Connection Code:

I would like to ensure that a Blazor Server app is secure against cross-origin attacks, in particular against the SignalR hub that Blazor Server is using. The app in question has no need to enable any cross-origin connections as far as I am aware.

Microsoft have a Blazor Server Threat Mitigation document, that states the need for Cross-origin protection (see here: Threat Mitigation). This document suggests that "opening a malicious WebSocket is also possible" and that

• Blazor Server apps can be accessed cross-origin unless additional measures are taken to prevent it. To disable cross-origin access, either disable CORS in the endpoint by adding the CORS middleware to the pipeline and adding the DisableCorsAttribute to the Blazor endpoint metadata or limit the set of allowed origins by configuring SignalR for cross-origin resource sharing.
• If CORS is enabled, extra steps might be required to protect the app depending on the CORS configuration. If CORS is globally enabled, CORS can be disabled for the Blazor Server hub by adding the DisableCorsAttribute metadata to the endpoint metadata after calling MapBlazorHub on the endpoint route builder.

If I understand the above correctly, I need to "disable CORS in the endpoint by adding the CORS middleware to the pipeline and adding the DisableCorsAttribute to the Blazor endpoint metadata", but so far I have been unable to figure out how to do this. [Edit: I think my answer covers this part of the question.]

The above article also references another on SignalR security (see here: Security considerations in ASP.NET Core SignalR) which says that "The protections provided by CORS don't apply to WebSockets. For origin restriction on WebSockets, read WebSockets origin restriction".

The article on WebSockets origin restriction describes how to configure cross origin protection for WebSockets, however this is not explained in the context of configuring the WebSockets used by Blazor Server and I am yet to figure out how to do this.

How do I ensure that my Blazor Server application is secure against cross origin requests to the SignalR hub via its WebSocket(s) or any other relevant connection mechanism(s)?

This Microsoft Docs article shows how to configure SignalR in a Blazor app. There's a step there that adds the response compression middleware for the application/octet-stream MIME type: