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PSGI: Failed to run Perl Application: 
Undefined subroutine &main::1 called.

#!/usr/bin/perl

...
get '/' => {text => 'Hello World'};

app->start;

{
   "type": "perl",
...
      "MOJO_MODE": "production"
   }
}

#!/usr/bin/perl
use strict;
...
    enable 'ContentLength';
    $app;
};