local response = http.request({url='http://www.google.com/recaptcha/api/verify',
    method='post',
    data={
        privatekey = '<YOUR PRIVATE KEY HERE>',
        remoteip = request.remote_addr,
        challenge = request.form.challenge,
        response = request.form.response
    }}).content
 
local firstline = response:match('[^\n]*')
if firstline == 'true' then
    -- CAPTCHA passed. Do things here.
    return { success=true }
else
    -- CAPTCHA failed.
    return { success=false }
end



$('#recaptchaButton').click(function (e) {
    e.preventDefault();
    $.post('https://examples.webscript.io/recaptcha',
        { challenge: Recaptcha.get_challenge(), response:Recaptcha.get_response() },
        function (data) {
            if (data.success) {
                alert("Captcha completed successfully!");
                loadCaptcha();
            } else {
                alert("Captcha failed.");
            }
        });
});