dumpRoutesIfRequested function
void
dumpRoutesIfRequested()
Prints the routing table and exits when routeDumpEnvVar is set.
Implementation
void dumpRoutesIfRequested() {
if (Platform.environment[routeDumpEnvVar] != '1') return;
stdout
..writeln(routeDumpMarker)
..writeln(describeRoutes());
exit(0);
}