Question

我想在依赖表Application Insight中跟踪 httpclient 请求的响应正文。我的应用程序与.NET Framework 4.8一起运行我创建了一个初始化器，以使用以下代码来跟踪“依赖关系”遥测：

public class TrackResponseBody : ITelemetryInitializer
{
    public void Initialize(ITelemetry telemetry)
    {
        var requestTelemetry = telemetry as DependencyTelemetry;

        if (requestTelemetry == null)
            return;

        if (requestTelemetry.TryGetOperationDetail("HttpResponse", out var responseObj))
        {
            var response = responseObj as HttpWebResponse;

            if (response != null)
            {
                using (var stream = response.GetResponseStream())
                {
                    var reader = new StreamReader(stream);
                    string result = reader.ReadToEnd();
                    requestTelemetry.Properties["ResponseBody"] = result;
                }
            }
        }
    }
}

但是当我尝试调用reader.ReadToEnd()时，我的代码会生成以下异常：System.NotSupportedException: 'The stream does not support concurrent IO read or write operations.'

如果我不尝试获取正文响应，则此代码可正确写入应用程序洞察依赖性日志中。

这就是我实现HttpClient的方式：

            var client_ = new HttpClient();

            client_.BaseAddress = new Uri("https://www.google.com");

            using (var request_ = new HttpRequestMessage())
            {
                request_.Method = new HttpMethod("GET");
                var response_ = await client_.SendAsync(request_).ConfigureAwait(false);
                var responseData_ = await response_.Content.ReadAsStringAsync().ConfigureAwait(false);
            }

有没有办法获取我的 HttpClient 的正文响应？

Answer 1

我自己尝试代码，在TrackResponseBody中，此行代码返回null：var response = responseObj as HttpWebResponse;，response变量始终为null。

然后我做一个小小的更改，而不是将responseObj转换为HttpWebResponse，我只是将responseObj转换为字符串，然后将其添加到requestTelemetry.Properties中。代码如下：

public class TrackResponseBody: ITelemetryInitializer
{
    public void Initialize(ITelemetry telemetry)
    {
        var requestTelemetry = telemetry as DependencyTelemetry;

        if (requestTelemetry == null)
            return;

        if (requestTelemetry.TryGetOperationDetail("HttpResponse", out var responseObj))
        {
            var response = responseObj as HttpWebResponse;

            //convert responseObj to string
            string s = responseObj.ToString();
            requestTelemetry.Properties["ResponseBody"] = s;
        }
    }

}

测试结果：

记录对应用程序洞察依赖性日志的响应正文

1 个答案: