HttpMessageHandlerStage.cs

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using System.Threading;
using System.Threading.Tasks;
 
namespace System.Net.Http;
 
internal abstract class HttpMessageHandlerStage : HttpMessageHandler
{
    protected internal sealed override HttpResponseMessage Send(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        ValueTask<HttpResponseMessage> valueTask = SendAsync(request, async: false, cancellationToken);
        if (!valueTask.IsCompleted)
        {
            return valueTask.AsTask().GetAwaiter().GetResult();
        }
        return valueTask.Result;
    }
 
    protected internal sealed override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        return SendAsync(request, async: true, cancellationToken).AsTask();
    }
 
    internal abstract ValueTask<HttpResponseMessage> SendAsync(HttpRequestMessage request, bool async, CancellationToken cancellationToken);
}