This middleware rescues any exception returned by the application and renders nice exception pages if it’s being rescued locally.
# File lib/action_dispatch/middleware/show_exceptions.rb, line 45 def call(env) begin status, headers, body = @app.call(env) exception = nil # Only this middleware cares about RoutingError. So, let's just raise # it here. if headers['X-Cascade'] == 'pass' raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}" end rescue Exception => exception raise exception if env['action_dispatch.show_exceptions'] == false end exception ? render_exception(env, exception) : [status, headers, body] end
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