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https://github.com/dotnet/corefx/blob/master/src/System.Net.Http/src/System/Net/Http/HttpMessageHandler.cs#L20corefxはHttpMessageHandlerとどのように機能しますか?保護されたメソッドを呼び出す方法
protected internal abstract Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken);
Task<HttpResponseMessage> task = _handler.SendAsync(request, cancellationToken);
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