Exceptions in ASP.NET CORE API not sent to Front

Question

In the startup.cs code I do the following in the Configure method :

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

As a result, in my environment is not Development, when calling the API from Postman or even from a dedicated frontend, the error details are not returned.

However the environment variable ASPNETCORE_DETAILEDERRORS is set to true , so I would expect to receive details of the exception.

As a workaround, I had to create my own configuration setting and change the code to :

         if (env.IsDevelopment() || Configuration["DetailedErrors"] == "true")
        {
            app.UseDeveloperExceptionPage();
        }

Do I really need to do that or am I missing something ?

ASPNETCORE_DETAILEDERRORS only affects startup errors. It doesn't, and isn't intended to, magically enable the developer exception page middleware. — Kirk Larkin
– Kirk Larkin, Commented Dec 15, 2020 at 14:04

Useme Alehosaini · Accepted Answer · 2020-12-15 11:33:56Z

1

According to

in my environment is not Development,

I understood that you wish to receive a detailed exception in the production environment.

if this is the case, you may just replace

    if (env.IsDevelopment() || Configuration["DetailedErrors"] == "true")
    {
        app.UseDeveloperExceptionPage();
    }

with

app.UseDeveloperExceptionPage();

Not critical but the if condition became useless I believe so better to get rid of it (as your ASPNETCORE_DETAILEDERRORS variable is set to true).

answered Dec 15, 2020 at 11:33

Useme Alehosaini

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1 Comment

Sam Over a year ago

I have tried that. Obviously by removing the condition, errors are returned fine. However if I set the ASPNETCORE_DETAILEDERRORS, the errors are STILL returned. I would expect this env variable to have some effect, but it does not seem to change anything.

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