C# 如何使用使用Fiddler捕获本地HttpClient发出的请求

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

/// 

/// GetToday.
/// 
/// 
[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