HttpClient 的所有方法是否都在内部调用 SendAsync 方法？

Question

是否 HttpClient 的所有方法，即 GetAsync、PostAsync 等都在内部调用 SendAsync 方法？

Answer 1

是的，HttpClient uses an HttpMessageHandler underneath to perform all HTTP requests. The HttpMessageHandler method Task<HttpResponseMessage> SendAsync(HttpRequestMessage, CancellationToken)就是HttpClient的叫法。

抽象classHttpMessageHandler的默认实现是HttpClientHandler。

You can pass in your own HttpMessageHandler implementation to the HttpClient constructor that takes one. 尽管您不太可能需要，但还是有应用程序的。例如，如果您想记录 HttpClient 发出的每个请求。您可以为 HttpMessageHandler.

创建一个 LoggingHttpMessageHandler 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 的所有方法是否都在内部调用 SendAsync 方法？

Does all methods of HttpClient internally invoke SendAsync method?

asp.net

httpclient

sendasync

asp.net-web-api

getasync