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Fix: ASP.NET Core API endpoints return 401 instead of redirecting to the login page after upgrading to .NET 10

startdebugging.net · published 15 September 2026

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https://learn.microsoft.com/en-us/aspnet/core/breaking-changes/10/cookie-authentication-api-endpoints
learn.microsoft.com
https://github.com/dotnet/aspnetcore/issues/9039
github.com
https://github.com/dotnet/aspnetcore/pull/63283
github.com
Typed results (Results) vs IResult vs IActionResult in ASP.NET Core 11 Read at the source ↗
startdebugging.net
JWT vs cookie authentication in ASP.NET Core 11: which should you pick? Read at the source ↗
startdebugging.net
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Mode
developer.mozilla.org
How to write integration tests with WebApplicationFactory in ASP.NET Core 11 Read at the source ↗
startdebugging.net
Migrate from .NET 8 to .NET 11: the full checklist Read at the source ↗
startdebugging.net
Why your ASP.NET Core JWT returns 401 even with a valid token Read at the source ↗
startdebugging.net
Fix: 405 Method Not Allowed instead of 401 with JWT bearer in ASP.NET Core Read at the source ↗
startdebugging.net
https://github.com/aspnet/Announcements/issues/525
github.com
https://github.com/dotnet/aspnetcore/pull/62816
github.com
https://github.com/dotnet/aspnetcore/blob/v10.0.0/src/Security/Authentication/Cookies/src/CookieAuthenticationEvents.cs
github.com
https://github.com/dotnet/aspnetcore/blob/v10.0.12/src/Http/Http.Extensions/src/RequestDelegateFactory.cs
github.com