aja()
  .method('get')
  .url('/api/customer')
  .data({firstname: 'john romuald'})
  .on('200', function(response){
      //well done
  })
  .go();

aja()
  .method('put')
  .url('/api/customer')
  .cache(false)
  .body({id : 12, firstname: 'john romuald', job : 'linguist'})
  .on('200', function(response){
      //well done
  })
   .on('40*', function(response){
      //something is definitely wrong
  })
  .on('500', function(response){
      //oh crap
  })
  .go();