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$('#SavetoPDF').on('click', function() {
    $.ajax({
        url: "https://sender.blockspring.com/api_v2/blocks/761172049d80626f51e221bb40e9b4b6?        api_key=731cdcfc88b680bdd6c8e4242677d39e",
        type: "POST",
        contentType: "application/json",
        data: JSON.stringify({ "html": "<html><body><p>Hello world - I love blockspring!</p><img src=\"http://s3.amazonaws.com/blockspring-static/kitten.jpg\" style=\"width: 300px;\"></img></body></html>"}),
        crossDomain: true
        }).done(function(response){
        console.log(response);
    });
});