Thanks! I'll try it, but it's weird. If I install NWJS for C2 v0.39.0 (Chromium 75) or earlier it works in preview.
C2 is another engine
but you can try a trick, when you send the first ajax a little red padlock will apper on the browser tab, click it and choose "Enable insecure Script", the page reload and nexts ajax will go.
apolog my english o.O