Basic Cross Origin Resource Sharing (CORS) support

CorsFilter.java

package org.springframework.web.servlet.support;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.filter.OncePerRequestFilter;

public class CorsFilter extends OncePerRequestFilter {

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {
        response.addHeader("Access-Control-Allow-Origin", "*");        
        if (request.getHeader("Access-Control-Request-Method") != null && "OPTIONS".equals(request.getMethod())); {
            // CORS "pre-flight" request
            response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
            response.addHeader("Access-Control-Allow-Headers", "Authorization");        
            response.addHeader("Access-Control-Max-Age", "1728000");
        }
        filterChain.doFilter(request, response);
    }

}

// example web.xml configuration

/*
  <filter>
    <filter-name>cors</filter-name>
    <filter-class>org.springframework.web.servlet.support.CorsFilter</filter-class>
  </filter>
  
  <filter-mapping>
    <filter-name>cors</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
*/