ServiceStack 从 Kestrel 捕获 HTTP 500 内部错误？答案

【问题标题】：ServiceStack captures HTTP 500 internal error from Kestrel?ServiceStack 从 Kestrel 捕获 HTTP 500 内部错误？
【发布时间】：2017-12-06 16:33:51
【问题描述】：

我有一个基于ServiceStack.Core(v1.0.44) 的自托管应用程序，来自ServiceStack.Kestrel(v1.0.44) 的ServiceStack.AppSelfHostBase 在内部依赖Kestrel http 服务器来处理请求。

该应用程序在我的本地机器上运行良好。但是当它被我们的构建服务器编译和部署时，它会返回一个模糊的 HTTP 500 错误。

调查了几个小时后，我发现原因是程序集重定向。因为 ServiceStack 延迟加载 AspNetCore 和其他程序集，所以启动时不会产生错误。当我尝试加载某些程序集时，HTTP 500 错误发生在我的代码执行之前。根本没有日志。

我的快速解决方法是将所有已签名的程序集包含在 app.config 文件的 assemblyBinding 部分中。

    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
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    <assemblyIdentity name="EntityFramework" publicKeyToken="b77a5c561934e089" culture="neutral" />
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  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="EntityFramework.SqlServer" publicKeyToken="b77a5c561934e089" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="6.0.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="log4net" publicKeyToken="1b44e1d426115821" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="1.2.10.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="Microsoft.AspNetCore.Authentication.Abstractions" publicKeyToken="adb9793829ddae60" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="2.0.1.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="Microsoft.AspNetCore.Authentication.Core" publicKeyToken="adb9793829ddae60" culture="neutral" />
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  <dependentAssembly>
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  <dependentAssembly>
    <assemblyIdentity name="Microsoft.AspNetCore" publicKeyToken="adb9793829ddae60" culture="neutral" />
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    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="2.0.1.0" />
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  <dependentAssembly>
    <assemblyIdentity name="Microsoft.AspNetCore.Http.Abstractions" publicKeyToken="adb9793829ddae60" culture="neutral" />
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  <dependentAssembly>
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  <dependentAssembly>
    <assemblyIdentity name="System.Security.Cryptography.Algorithms" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="4.2.1.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Security.Cryptography.Encoding" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="4.0.1.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Security.Cryptography.Primitives" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="4.0.1.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Security.Cryptography.X509Certificates" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="4.1.1.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Security.Principal.Windows" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="4.1.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Text.Encodings.Web" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="4.0.2.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Text.RegularExpressions" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="4.1.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Threading.Tasks.Extensions" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="4.1.1.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Xml.ReaderWriter" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-999.9.9.9" newVersion="4.1.0.0" />
  </dependentAssembly>
</assemblyBinding>

添加所有程序集的重定向后，问题就解决了。但我仍然不知道是哪些程序集导致了这个错误。 我的问题是：如何在 ServiceStack 延迟加载程序集失败时捕获此类错误？

【问题讨论】：

标签： servicestack kestrel-http-server

【解决方案1】：

ServiceStack 没有进行任何延迟加载，.NET 自然只会在运行使用这些依赖项的代码时加载依赖项。如果您在 AppHost Configure() 中使用依赖项，它将强制在启动时使用它们，以便您可以执行诸如解析服务和执行测试请求之类的操作，例如：

using (var service = container.TryResolve<MyServices>())
{
    var response = service.Any(new MyRequest());
}

【讨论】：

不，它不起作用，从上面的代码启动时没有抛出异常。但在那之后，除非我放回所有assemblyBinding，否则仍然会出现 HTTP 500 错误
它不会阻止需要任何必要的程序集绑定，它只是展示如何在启动时执行服务的示例。由于这是一个 App 配置问题，因此在 Startup 上运行的相同代码不太可能在运行时失败。您可能没有使用正确的依赖项，第一次使用时抛出异常。
谢谢@mythz，我知道程序集绑定是必要的，但我想找出确切的不匹配程序集。目前它只返回 HTTP 500 错误，没有发生异常，很难判断哪些程序集不匹配。