C# 使用Fiddler捕获本地HttpClient发出的请求操作

示例接口定义

为了方便笔者先自己写了个简单的接口用于展示，返回当前时间，具体如下

/// <summary>
/// GetToday.
/// </summary>
/// <returns></returns>
[HttpGet]
[Route("GetTime/Today")]
public MyDateTime GetToday()
{
var now = DateTime.Now;
return new MyDateTime
{
 Year = now.Year,
 Month = now.Month,
 Day = now.Day,
 Hour = now.Hour,
 Minute = now.Minute,
 Second = now.Second,
};
}

上面的MyDateTime是展示用的自定义类，其中的属性已在return中表示。

使用HttpClient发起请求

var httpClient = new HttpClient();
var url = "http://localhost:5000/GetTime/Today";
var response = await httpClient.GetAsync(new Uri(url));

不出意外Fiddler是抓不到的。

配置Fiddler

打开Tools->Options

然后切换到Connections选项卡，我们可以看到Fiddler默认监听的是8888端口，这就好办了我们需要开启HttpClient中的代理。

设置HttpClient

修改请求为：

var httpClient = new HttpClient(new HttpClientHandler
{
UseProxy = true, // 使用代理，
Proxy = new WebProxy(new Uri("http://localhost:8888")) // port:8888就是Fiddler默认监听的端口
});

var url = "http://localhost:5000/GetTime/Today";
var response = await httpClient.GetAsync(new Uri(url));

再次发起请求

Fiddler已经抓到了

补充知识：解决Fiddler无法捕获本地HttpWebRequest（C#.net）请求和HttpURLConnection（Java）请求

方法很简单，就是设置本地代理

C#

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);

req.Proxy = new WebProxy("127.0.0.1:8888", true);

Java

jre -DproxySet=true -DproxyHost=127.0.0.1 -DproxyPort=8888 MyApp

或者

System.setProperty("http.proxyHost", "localhost");
System.setProperty("http.proxyPort", "8888");
System.setProperty("https.proxyHost", "localhost");
System.setProperty("https.proxyPort", "8888");

来源：https://blog.csdn.net/ZUFE_ZXh/article/details/108574353