After some searching, I’ve written the following code in Program.cs:

#region Localization
builder.Services.AddLocalization(option =>
{
    option.ResourcesPath = "Resources";
});

builder.Services.Configure<RequestLocalizationOptions>(options =>
{
    var supportedCultures = new[] { "en", "ru" };
    options.SetDefaultCulture(supportedCultures[0])
        .AddSupportedCultures(supportedCultures)
        .AddSupportedUICultures(supportedCultures);
});
#endregion

app.UseRequestLocalization();

I’m trying to use localization like this:

[ApiController]
[Route("api/[controller]")]
public class AuthController : ControllerBase
{    private readonly static Logger _logger = LogManager.GetCurrentClassLogger();

    private readonly IStringLocalizer<AuthController> _localizer;

    public AuthController(IStringLocalizer<AuthController> localizer)
    {
        _localizer = localizer;
    }

    [HttpGet("test")]
    public string Test()
    {
        return _localizer["About Title"];
    }
}

I’ve tried adding ui-culture=ru to the request and setting Accept-Language to ru, but the server still returns “About Title”

I wanted to get an answer in one of the localization languages