For an asp.net web forms application, I am attempting to generate an httpclient from an httpclientfactory. However, the returned httpclient does not have the configuration (the base address and headers) that I configured in the GetHttpClientFactory method.

public static class HttpClientFactory
{
    private static IHttpClientFactory _httpClientFactory;
    private const string _ClientKey = "MyClient";

    public static IHttpClientFactory GetHttpClientFactory()
    {
        if (_httpClientFactory != null)
        {
            return _httpClientFactory;
        }
        var serviceCollection = new ServiceCollection();

        serviceCollection.AddHttpClient(_ClientKey, client =>
            {
                client.BaseAddress = new Uri("http://localhost:36338");
                client.DefaultRequestHeaders.Add("Accept", "application/json");
                client.DefaultRequestHeaders.Add("User-Agent", "Demo");
            })
            .ConfigurePrimaryHttpMessageHandler(() =>
                new HttpClientHandler
                {
                    Credentials = new NetworkCredential("accountname", "password")
                });
        var serviceProvider = serviceCollection.BuildServiceProvider();
        _httpClientFactory = serviceProvider.GetService<IHttpClientFactory>();
        
        return _httpClientFactory;
    }

}

Here is where I am calling into the factory to generate the client.

protected async void Page_Load(object sender, EventArgs e)
    {
        //RegisterAsyncTask(new PageAsyncTask(GetDivisions));
        var loggerFactory = LoggerFactory.Create(builder => {
            builder.AddFilter("Microsoft", LogLevel.Warning);
            });
        var httpClient = HttpClientFactory.GetHttpClientFactory();
        var commonServices = new ServiceWrapper(loggerFactory.CreateLogger<ServiceWrapper>(), httpClient);
        var divisions = await commonServices.GetDivisions();
        foreach (var d in divisions)
            AddTableRow(Table1, d.Id, d.Name);
    }

Each time I make a web request, I get an exception that "An invalid request URI was provided".

CodePudding user response：

I'm pretty much sure that you are calling CreateClient without providing the client name. Try next in your ServiceWrapper:

// 1. not sure how the second parameter of ServiceWrapper is called
// 2. Possibly make HttpClientFactory._ClientKey public so no need for magic string
var result = httpClientFactory.CreateClient("MyClient");