Disable AutoRedirect in FlurlClient

Question

I am using FlurlHttp and I want to disable AllowAutoRedirect for some API calls. I know How can I get System.Net.Http.HttpClient to not follow 302 redirects?

WebRequestHandler webRequestHandler = new WebRequestHandler();
webRequestHandler.AllowAutoRedirect = false;
HttpClient httpClient = new HttpClient(webRequestHandler);
// Send a request using GetAsync or PostAsync
Task<HttpResponseMessage> response = httpClient.GetAsync("http://www.google.com")

But for Flurl I found only the way similar to described in C# Flurl - Add WebRequestHandler to FlurlClient (I haven't compiled yet the code below , so it may have some errors)

public class HttpClientFactoryWithWebRequestHandler : DefaultHttpClientFactory
{
    private readonly WebRequestHandler _webRequestHandler;

    public HttpClientFactoryWithWebRequestHandler (WebRequestHandler webRequestHandler ) 
    {
        _webRequestHandler = webRequestHandler ;
    }

    public override HttpMessageHandler CreateMessageHandler()
    {
        var handler =_webRequestHandler ;
//Or    var handler = new WebRequestHandler(_webRequestHandler );
        return handler;
    }
}

Then I can pass the setting for a new FlurlClient:

WebRequestHandler webRequestHandler = new WebRequestHandler();
webRequestHandler.AllowAutoRedirect = false;
var fc = new FlurlClient(url)
    .ConfigureClient(c => c.HttpClientFactory = 
                  new HttpClientFactoryWithWebRequestHandler (webRequestHandler));

It looks more complicated that it could be. Is it the right way to do or it can be done simplier?

UPDATE 2021: Flurl now supports out of the box

await url.WithAutoRedirect(false).GetAsync();

See more options in https://flurl.dev/docs/configuration/#redirects

@ToddMenier, For current task it's OK, because the client is a microservice running as separate small MVC site — Michael Freidgeim, Oct 07 '17 at 01:23

Todd Menier · Answer 1 · 2021-06-18T14:07:21.673

This answer is obsolete as of Flurl 3.0. Per the accepted answer, Flurl now supports a wealth of redirect features out the box.

It feels a little heavy because it's a scenario that Flurl doesn't support directly, so it requires tinkering under the hood a bit. You're on the right track but I think there's a few ways you could simplify it. First, I'd suggest creating the WebRequestHandler inside the factory. Creating it externally and passing it in seems unnecessary.

public class NoRedirectHttpClientFactory : DefaultHttpClientFactory
{
    public override HttpMessageHandler CreateMessageHandler()
    {
        return new WebRequestHandler { AllowAutoRedirect = false };
    }
}

If you want this behavior app-wide by default, you could register it globally on startup. Then you don't need to do anything with individual FlurlClients.

FlurlHttp.Configure(settings =>
    settings.HttpClientFactory = new NoRedirectHttpClientFactory());

Otherwise, if you need the ability to pick and choose which FlurlClients you disable it for, an extension method would make it a little easier:

public static IFlurlClient WithoutRedirects(this IFlurlClient fc) {
    fc.Settings.HttpClientFactory = new NoRedirectHttpClientFactory();
    return fc;
}

Then use it like this:

new FlurlClient(url).WithoutRedirects()...

Thanks for your suggestion, but `FlurlClient.HttpClient.AllowAutoRedirect = false;` and `client.AllowAutoRedirect = false;` will not work. AllowAutoRedirect is a property of [HttpClientHandler](https://msdn.microsoft.com/en-us/library/system.net.http.httpclienthandler(v=vs.110).aspx), not HttpClient. I wish to have `FlurlClient.HttpClientHandler` property. — Michael Freidgeim, Oct 07 '17 at 01:53

Eric Eskildsen · Accepted Answer · 2021-06-18T14:02:46.340

5

Flurl now supports this natively:

"https://example.com"
  .WithAutoRedirect(false)
  [...]

Documentation: https://flurl.dev/docs/configuration/#redirects

edited Jun 18 '21 at 14:02

answered May 21 '21 at 18:10

Eric Eskildsen

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Michael Freidgeim · Answer 3 · 2018-07-31T06:13:06.917

My implementation is based on Todd's answer (minor class/method name changes)

Example of use:

var resp = await new FlurlClient(url).DisableRedirects().Request().AllowAnyHttpStatus().GetAsync();
resp.StatusCode.Should().Be(HttpStatusCode.Found);//302

Implementation:

 public class HttpClientFactoryWithWebRequestHandler : DefaultHttpClientFactory
    {
        private readonly HttpMessageHandler _httpMessageHandler;
        public HttpClientFactoryWithWebRequestHandler(HttpMessageHandler httpMessageHandler) 
        {
            _httpMessageHandler = httpMessageHandler;
        }

        public override HttpMessageHandler CreateMessageHandler()
        {
            var handler = _httpMessageHandler;
            return handler;
        }
    }
    public static class FlurlClientExtensions
    {
        public static IFlurlClient DisableRedirects(this IFlurlClient fc)
        {
            var httpClientHandler = new HttpClientHandler {AllowAutoRedirect = false};
            fc.Settings.HttpClientFactory = new HttpClientFactoryWithWebRequestHandler(httpClientHandler);
            return fc;
        }
    }

Disable AutoRedirect in FlurlClient

3 Answers3

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