为什么在我的C#winforms应用程序中第一次HttpClient.PostAsync调用极其缓慢? [英] Why is first HttpClient.PostAsync call extremely slow in my C# winforms app?

问题描述

我有一个像这样的httpclient:

I have an httpclient like this :

var client = new HttpClient();

我这样张贴:

var result = client.PostAsync(
                endpointUri,
                requestContent);

并获得如下响应:

HttpResponseMessage response = result.Result;

我知道此调用将阻塞线程，这就是线程应该如何工作的(只需为自己构建工具，不需要异步线程即可)

I understand this call will block the thread, thats how its supposed to work (just building a tool for myself, no async threads needed)

我第一次运行此呼叫，大约需要2分钟才能得到结果.同时，如果我在其他地方进行完全相同的调用，则它会在200毫秒内完成.即使我点击了google，也需要2分钟.但是，在第一个通话之后，只要我保持应用程序打开，任何其他通话都可以.当我打开应用程序时，它只是第一次校准.可能是什么原因造成的?

The first time I run this call, it takes about 2 minutes to get a result. Meanwhile, if I do the exact same call elsewhere its done in 200ms. Even if I hit google, it takes 2 minutes. But, after the first call, as long as I keep the app open any additional calls are good. Its just the first cal when I open the application. What could be causing this?

推荐答案

问题是，它在尝试为客户端解析代理时挂了很长时间.像这样初始化HttpClient可以达到目的:

The problem was that it was hanging for a very long time trying to resolve a proxy for the client. Initializing the HttpClient like this did the trick:

var client = new HttpClient(new HttpClientHandler
            {
                UseProxy = false
            });

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