You need to use the Content-Disposition HTTP header to speficy filename different from xyz:
location = /xyz {
    alias /path/abc.tst;
    add_header Content-Disposition 'attachment; filename="abc.tst"';
}

You may also need to specify MIME type for this file, use default_type directive, for generic binary data try
default_type application/octet-stream;

    
    
    
        
            answered May 20, 2021 at 21:18
        
        
    
    
        
    
    
        Ivan ShatskyIvan Shatsky15.8k2 gold badges25 silver badges51 bronze badges
        
    

    





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