Disable AutoRedirect in FlurlClient

问题

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?

回答1:

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()...

回答2:

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;
        }
    }

来源：https://stackoverflow.com/questions/46615548/disable-autoredirect-in-flurlclient

标签

redirect

dotnet-httpclient

asp.net-core-webapi

flurl