Here is an example of Java Servlet doPost() method ...
//PrintWriter to send the JSON response back PrintWriter out = response.getWriter(); //set content type and header attributes response.setContentType("text/html"); response.setHeader("Cache-control", "no-cache, no-store"); response.setHeader("Pragma", "no-cache"); response.setHeader("Expires", "-1"); response.setHeader("Access-Control-Allow-Origin", "*"); response.setHeader("Access-Control-Allow-Methods", "POST"); response.setHeader("Access-Control-Allow-Headers", "Content-Type"); response.setHeader("Access-Control-Max-Age", "86400"); out.println("<html><head><script type=\"text/javascript\">document.domain = \"yourDomain.com\"</script></head><body>"); JsonObject myObj = new JsonObject(); myObj.addProperty("success", true); out.println(myObj.toString()); out.println("</body></html>"); out.close();
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