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查看 IIS 日志时，我看到一些 HTTP 400 响应。为了诊断问题，我通过以下配置启用了 SVCTrace....

<system.diagnostics>
    <sources>
        <source name="System.ServiceModel.MessageLogging" switchValue="Warning, ActivityTracing">
            <listeners>
                <add type="System.Diagnostics.DefaultTraceListener" name="Default">
                    <filter type="" />
                </add>
                <add name="ServiceModelMessageLoggingListener">
                    <filter type="" />
                </add>
            </listeners>
        </source>
        <source name="System.ServiceModel" switchValue="Warning, ActivityTracing"
         propagateActivity="true">
            <listeners>
                <add type="System.Diagnostics.DefaultTraceListener" name="Default">
                    <filter type="" />
                </add>
                <add name="ServiceModelTraceListener">
                    <filter type="" />
                </add>
            </listeners>
        </source>
    </sources>
    <sharedListeners>
        <add initializeData="C:\temp\messages.svclog"
         type="System.Diagnostics.XmlWriterTraceListener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
         name="ServiceModelMessageLoggingListener" traceOutputOptions="Timestamp">
            <filter type="" />
        </add>
        <add initializeData="C:\temp\tracelog.svclog"
         type="System.Diagnostics.XmlWriterTraceListener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
         name="ServiceModelTraceListener" traceOutputOptions="Timestamp">
            <filter type="" />
        </add>
    </sharedListeners>
</system.diagnostics>

虽然 IIS 继续接收 HTTP 400 响应，但这些不会显示在 SVCTrace 文件中。我认为这是因为 HTTP 400 意味着错误请求，因此从未向 WCF 发出错误请求以包含在跟踪文件中。这是一个不正确的假设吗？

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