bvalidator Server side validation

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jQuery

Hi,

I am new in bvalidator. In my project we are now using bvalidator. I would like to validate the existence of a user. When I read the bvalidator documentation I've seen the use of ajax[ajax_response.txt] in it. But I can't understand from where we get the response.txt file. From where we can call the server method. Could you please help me. Thanks in advance.