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  • So you think I should basically send a response with error code and maybe a reason in json from my error handler? Validating data before sending a request, on a client side doesn't make any sense - consider a case when you try to participate in a specific event, but you are already assigned for another event at the sime time - I don't want this validation to be done on client side. And maybe there is another, domain restriction which states you cannot participate in specific event - how would you check it on client side? Commented Feb 16, 2015 at 11:15