Purpose of "consider_all_requests_local" in config/environments/development.rb?

Non-local requests result in user-friendly error pages. Local requests, assumed to come from developers, see a more useful error message that includes line numbers and a backtrace. consider_all_requests_local allows your app to display these developer-friendly messages even when the machine making the request is remote.

At development level we set:

consider_all_requests_local set = true

because developer needs to take a look at full error showing layout/view as you can see in the image below.

But at production level, we don't need to show our internal coding bug so we set false:

config.consider_all_requests_local = false