As it is answered here, HttpServlet.doOptions() method has to be overridden the following way:
import java.io.IOException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings("serial")
@WebServlet(
name = "MyServlet",
urlPatterns = {"/myservlet"}
)
public class MyServlet extends HttpServlet {
@Override
protected void doOptions
(
HttpServletRequest req,
HttpServletResponse resp
)
throws IOException {
resp.setHeader("Access-Control-Allow-Origin", "*");
resp.setHeader("Access-Control-Allow-Methods", "POST, OPTIONS");
resp.setHeader("Access-Control-Allow-Headers", "*");
}
@Override
protected void doPost
(
HttpServletRequest req,
HttpServletResponse resp
)
throws IOException {
resp.setHeader("Access-Control-Allow-Origin", "*");
resp.setContentType("text/plain");
resp.setCharacterEncoding("UTF-8");
resp.getOutputStream().println("OK");
}
@Override
protected void doGet
(
HttpServletRequest req,
HttpServletResponse resp
)
throws IOException {
doPost(req, resp);
}
}
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