anchor.diff:  
   + Request (application/json)
   
  -    + Attributes (Flashcard)
  +    + Attributes (FlashcardWithoutId)
   
   + Response 201 (application/json)
   
  
positive.code: 
  + Request (application/json)
  
      + Attributes (Flashcard)
  
  + Response 200 (application/json)
  
      This response is returned when flashcard was updated.
      
      + Attributes (Flashcard)
  
  + Response 400 (application/json)
  
      This response is returned when flashcard validation failed.
  
      + Body
  
  ### Remove Flashcard [DELETE /decks/{deckId}/flashcards/{flashcardId}]
  
  
negative.code:             Access-Control-Expose-Headers: Location
              Location: /decks/1111-0000-0000-000000000001
  
      + Attributes (Deck)
  
  + Response 400 (application/json)
  
  