从Azure函数HttpTrigger返回错误详细信息

问题描述

我用HTTP触发器创建了一个Azure函数.我希望将详细的错误信息返回给调用者.有没有办法解决未捕获的异常?奇怪的是，Azure Functions在Visual Studio中运行时会返回详细的错误信息，但在部署时却不会返回.

I've created an Azure Function with an HTTP trigger. I would like detailed error information to be returned to callers. Is there a way of doing for uncaught exceptions? Strangely, Azure Functions does return the detailed error info when running in Visual Studio, but not when deployed.

[FunctionName("MyAzureFunction")]
public static async Task<HttpResponseMessage> RunAsync(
    [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequestMessage httpRequest,
    TraceWriter traceWriter,
    CancellationToken cancellationToken)
{
    try
    {
        var response = await ProcessAsync(request, cancellationToken);

        return httpRequest.CreateResponse(HttpStatusCode.OK, response);
    }
    catch (ArgumentException ex)
    {
        traceWriter.LogWarning($"Argument error: {ex}");
        return httpRequest.CreateResponse(HttpStatusCode.BadRequest, ex.Message);
    }
    catch (Exception ex)
    {
        traceWriter.LogError($"Error: {ex}");
        throw;
    }
}

推荐答案

通常，从安全角度来看，将异常详细信息返回给外部调用者被认为是不好的做法.因此，默认情况下可以屏蔽此信息.

Generally, returning exception details to the external caller is considered bad practice from security standpoint and otherwise. Because of that, it makes sense to block this information by default.

我将throw;语句替换为返回手动格式化错误的语句.如果您可以将异常消息公开给调用者，那么就很简单

I would replace throw; statement with the one returning manually formatted error. If you are OK with exposing the exception message to the caller, it's as simple as

return httpRequest.CreateResponse(HttpStatusCode.InternalServerError, ex.Message);

如果调用方是外部的，我也不会这样做:相反，返回一般错误消息，然后依靠日志进行调试.

If the caller is external, again, I would not do that: instead, return a generic error message and then rely on logging for debugging.

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