c# - MVC ASP.NET Core Show detailed error for staging environment

I tried to set the staging environment where I can see the detailed error. If I switch the ASPNETCORE_ENVIRONMENT to Development, I will see the detailed error. I am going to explain below.

launchSettings.json:

{
    "profiles": {
      "IIS Express": {
        "commandName": "IISExpress",
        "launchBrowser": true,
        "environmentVariables": {
          "ASPNETCORE_ENVIRONMENT": "Development"
        }
      },
      "TestApp-DEV": {
        "commandName": "Project",
        "launchBrowser": true,
        "environmentVariables": {
          "ASPNETCORE_ENVIRONMENT": "Development"
        },
        "dotnetRunMessages": true,
        "applicationUrl": "https://localhost:7000;http://localhost:5000"
      },
      "TestApp-PROD": {
        "commandName": "Project",
        "launchBrowser": true,
        "environmentVariables": {
          "ASPNETCORE_ENVIRONMENT": "Production"
        },
        "dotnetRunMessages": true,
        "applicationUrl": "https://localhost:7000;;
      },
      "TestApp-Staging": {
        "commandName": "Project",
        "launchBrowser": true,
        "environmentVariables": {
          "ASPNETCORE_ENVIRONMENT": "Staging"
        },
        "dotnetRunMessages": true,
        "applicationUrl": "https://localhost:7000;;
      }
    },
    "iisSettings": {
      "windowsAuthentication": false,
      "anonymousAuthentication": true,
      "iisExpress": {
        "applicationUrl": "http://localhost:40116",
        "sslPort": 44301
      }
    }
  }

appsettings.json has 3 different configuration files. Note that the appsettings.Staging.json and appsettings.Production.json are almost the same configuration.

If I run the project at localhost with "TestApp-DEV" environment, I will see the detailed error page.
If I run the project at localhost as either Staging or Production, I will receive this message:

My workaround for troubleshooting related to production environment is that I rename the appsettings.Development.json to something temporary, then change the name appsettings.Staging.json to appsettings.Development.json and run the project in development env so I can see the detailed error that is related to production. After that, revert back the appsettings names.

Is there a way show the detailed error when I run the project at locolhost in staging or projection environment?

I tried to set the staging environment where I can see the detailed error. If I switch the ASPNETCORE_ENVIRONMENT to Development, I will see the detailed error. I am going to explain below.

launchSettings.json:

{
    "profiles": {
      "IIS Express": {
        "commandName": "IISExpress",
        "launchBrowser": true,
        "environmentVariables": {
          "ASPNETCORE_ENVIRONMENT": "Development"
        }
      },
      "TestApp-DEV": {
        "commandName": "Project",
        "launchBrowser": true,
        "environmentVariables": {
          "ASPNETCORE_ENVIRONMENT": "Development"
        },
        "dotnetRunMessages": true,
        "applicationUrl": "https://localhost:7000;http://localhost:5000"
      },
      "TestApp-PROD": {
        "commandName": "Project",
        "launchBrowser": true,
        "environmentVariables": {
          "ASPNETCORE_ENVIRONMENT": "Production"
        },
        "dotnetRunMessages": true,
        "applicationUrl": "https://localhost:7000;https://TestApp.scm.azurewebsites"
      },
      "TestApp-Staging": {
        "commandName": "Project",
        "launchBrowser": true,
        "environmentVariables": {
          "ASPNETCORE_ENVIRONMENT": "Staging"
        },
        "dotnetRunMessages": true,
        "applicationUrl": "https://localhost:7000;https://TestApp.scm.azurewebsites"
      }
    },
    "iisSettings": {
      "windowsAuthentication": false,
      "anonymousAuthentication": true,
      "iisExpress": {
        "applicationUrl": "http://localhost:40116",
        "sslPort": 44301
      }
    }
  }

appsettings.json has 3 different configuration files. Note that the appsettings.Staging.json and appsettings.Production.json are almost the same configuration.

If I run the project at localhost with "TestApp-DEV" environment, I will see the detailed error page.
If I run the project at localhost as either Staging or Production, I will receive this message:

Is there a way show the detailed error when I run the project at locolhost in staging or projection environment?

Share Improve this question edited Feb 4 at 21:48 asked Feb 4 at 19:36 Milacay 1,5359 gold badges36 silver badges63 bronze badges

What version of ASP.NET Core are you running? Ideally it would be great to have a minimal reproducible example at hand. – Guru Stron Commented Feb 4 at 19:49

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1 Answer 1

Sorted by: Reset to default 3

Probably the easiest approach would be to just use developer exception page on the staging:

// somewhere close to var app = builder.Build();
if (app.Environment.IsStaging())
{
    app.UseDeveloperExceptionPage();
}

Probably you can add extra config value to check if it should be enabled (and set it up in launchSettings or appSettings).

Also you can use conditional pipeline. For example:

if (app.Environment.IsStaging())
{
    app.UseWhen(ctx => ctx.Request.Host.Host.Equals("localhost", StringComparison.OrdinalIgnoreCase),
        appBuilder => appBuilder.UseDeveloperExceptionPage());
}

or just wrap the UseDeveloperExceptionPage into #if DEBUG as @Jeremy Lakeman if this is needed only for debug builds and local debugging.

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c# - MVC ASP.NET Core Show detailed error for staging environment - Stack Overflow

1 Answer 1

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