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  1. or download this
    #!/usr/bin/perl -w
    use strict;
    ...
    warn "HTTP $status" if is_error $status;
    
    system qw(diff -u), "$file.old", $file;
    
  2. or download this
     #!/usr/bin/perl -w
     use strict;
    ...
    +warn "HTTP $status" if is_error $status;
    
     system qw(diff -u), "$file.old", $file;