Share cookies in Spring MVC - spring-mvc

Question

I have an existing web application which runs on
https://subdomain.example.com
Now I like to have additional subdomains
https://subdomain2.example.com
How can I set the following using Spring MVC so that the user will not be prompted for authentication again after being redirected from the first domain to the second domain ?
Set-Cookie: name=value; domain=example.com

Answer 1

Look at this controller example, but keep in mind 2 things:
putting an arbitrary fixed domain will not allow you to access the cookie when you work in your local environment if you connect to 127.0.0.1.
your cookie could be read by all the subdomain present on that host(example.com), not only by the ones you want.
Class:
package com.test.foo;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#Controller
#RequestMapping("/foo")
public class FooController {
#RequestMapping("/cookie")
public String setCookie(HttpServletRequest request, HttpServletResponse response) {
String value = "value";
Cookie cookie = new Cookie("name", value);
cookie.setPath("/");//<-- important
cookie.setDomain("example.com");
response.addCookie(cookie);
return "foo/index";//your view
}
}