Upon updating our server-side code to asp.net core 3.1, we encountered an issue with the javascript client for signalr (@microsoft/signalr 3.1.0).
The errors we are facing are:
https://i.sstatic.net/ITZyK.png
Here is the code snippet for the hub initialization:
https://i.sstatic.net/u2oEx.png
Our access token factory retrieves the token from msal. (The authentication process remains unchanged and the token is correctly received) Any assistance with this would be highly appreciated.
I encountered an issue while using the @aspnet/signalr javascript client, which is the same version as the Nuget package on the server. Strangely, I couldn't get it to work with @microsoft/signalr.
Upon investigation, I realized that the authentication was failing due to a missing AllowCredentials on Cors in the startup configuration:
public void ConfigureServices(IServiceCollection services)
{
services
.AddControllers();
services.AddCors(options => options.AddPolicy("CorsPolicy", builder =>
{
builder
.AllowAnyMethod() //customize as needed
.AllowAnyHeader() //customize as needed
.AllowAnyOrigin() //customize as needed
.AllowCredentials();
}));
services.AddSignalR();
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseHttpsRedirection();
app.UseRouting();
app.UseAuthorization();
}
After encountering a similar error myself, I discovered that the issue stemmed from the length of the access_token being passed in the query parameter. This problem is further discussed in this thread regarding a query string becoming too lengthy due to a large bearer token attached in the URL.
To resolve this issue, I recommend following the solution outlined in this specific response.
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