Spring Boot 2 - get origin from HttpServletRequest

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// --------------------------------------------
// ExampleController.java file:
// --------------------------------------------

package com.example;

import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;

import common.utils.DomainUtils;

@Controller
public class ExampleController {

    @RequestMapping(value = "/example")
    public ResponseEntity<String> example(HttpServletRequest request) {
        String siteOrigin = DomainUtils.getOrigin(request);  // <------------------- gets origin from HttpServletRequest
        return ResponseEntity.ok("Origin: " + siteOrigin);
    }
}



// --------------------------------------------
// DomainUtils.java file:
// --------------------------------------------

package com.example;

import javax.servlet.http.HttpServletRequest;

public final class DomainUtils {

    private static final int NORMAL_POST = 80;
    private static final int SECURE_POST = 443;

    private static final String NORMAL_SCHEME = "http";
    private static final String SECURE_SCHEME = "https";

    private DomainUtils() {
        // nothing here ...
    }

    public static String getOrigin(HttpServletRequest request) {
        int serverPort = request.getServerPort();
        String serverName = request.getServerName();
        String requestScheme = request.getScheme();
        if (serverPort == NORMAL_POST && NORMAL_SCHEME.equals(requestScheme)) {
            return requestScheme + "://" + serverName;
        }
        if (serverPort == SECURE_POST && SECURE_SCHEME.equals(requestScheme)) {
            return requestScheme + "://" + serverName;
        }
        return requestScheme + "://" + serverName + ":" + serverPort;
    }
}