Question

HttpClient的所有方法，即GetAsync，PostAsync等内部是否都在调用SendAsync方法？

Answer 1

是的，HttpClient使用下面的HttpMessageHandler来执行所有HTTP请求。 HttpMessageHandler方法Task<HttpResponseMessage> SendAsync(HttpRequestMessage, CancellationToken)是HttpClient调用的方法。

抽象类HttpMessageHandler的默认实现是HttpClientHandler。

You can pass in your own HttpMessageHandler implementation to the HttpClient constructor that takes one.虽然您不太可能需要，但有应用程序。例如，如果您想记录HttpClient生成的每个请求。您可以为LoggingHttpMessageHandler制作HttpMessageHandler装饰器。

using (var handler = new HttpClientHandler())
using (var loggingHandler = new LoggingHttpClientHandler(handler, logger))
using (var client = new HttpClient(loggingHandler))
{
    // Logs "GET https://www.google.com/"
    var response = await client.GetAsync("https://www.google.com/");
    ...
}

HttpClient的所有方法都在内部调用SendAsync方法吗？

1 个答案: