HttpClient 在 GetAsync 上挂起 ERR_CONNECTION_REFUSED

Question

I am attempting to get the status of a website in a .NET Core 3.1 worker service await client.GetAsync is only hanging on ERR_CONNECTION_REFUSED from the host

Program.cs

public static IHostBuilder CreateHostBuilder(string[] args) =>
                Host.CreateDefaultBuilder(args)
               .UseWindowsService()
               .ConfigureServices((hostContext, services) =>
                    {
                        services.AddHostedService<Worker>();
                        services.AddHttpClient();
                    });

Worker Constructor

   public Worker(ILogger<Worker> logger, IConfiguration configuration, IHttpClientFactory clientFactory)
    {
        _logger = logger;
        _configuration = configuration;
        _clientFactory = clientFactory;
    }

And later in the worker in the ExecuteAsync method.

var client = _clientFactory.CreateClient();
var Siteresult = await client.GetAsync(_siteAdress);

ERR_CONNECTION_REFUSED from the server is the only way we can get this failing. The worker does not recover, We replicate this by turning off the site in IIS (when we turn off the app pool we get a helpful 503 and works well) we browse to the site in chrome and get ERR_CONNECTION_REFUSED but the worker just hangs.

Answer 1

In case anyone else is wondering, as per the documentation documentation using try-catch is required with an asynchronous call

        bool siteDown=false;

        try
        {
            HttpResponseMessage response = await client.GetAsync(_siteAdress);
            response.EnsureSuccessStatusCode();

        }  
        catch(HttpRequestException e)
        {
            siteDown = true; 
            _logger.LogError("Message :{0} ", e.Message);

        }