How to redirect/forward angular page from spring boot?

Question

I am developing a application with angular 6 as front end and spring boot as back end. In this while implementing user authentication module I want to redirect to student and staff home after login accordingly.

But, I am not able to redirect the page from spring boot. Using Redirect to an external URL from controller action in Spring MVC this solution I am getting the CORS error : "Request header field content-type is not allowed by Access-Control-Allow-Headers in preflight response."

Or, if there is another way to do this task?

AuthenticationController.java

package sgsits.cse.dis.user.controller;

@CrossOrigin(origins = "*") // enables cross origin request
@RestController
@RequestMapping(value = "/dis")
@Api(value = "Authentication Resource")
public class AuthenticationController {

@Autowired
StudentRepository studRepo;
@Autowired
StaffRepository staffRepo;
@Autowired
EmailController email;

String pattern = "MM-dd-yyyy";
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);

@ApiOperation(value = "login", response = Object.class, httpMethod = "POST", produces = "application/json")
@RequestMapping(value = "/login", method = RequestMethod.POST)
public String login(@RequestBody Authentication auth, HttpServletResponse httpServletResponse) {
    Optional<StaffProfile> staff = staffRepo.findByEmail(auth.getUsername());
    if (staff.isPresent()) {
        String md5_pass = MD5.getHash(auth.getPassword());
        if (staff.get().getPassword().equals(md5_pass)) {
            // set session
            // update last login

            return "forward:/localhost:4200/staff";
        } else

            return "You have entered incorrect password";
    } else {
        Optional<StudentProfile> student = studRepo.findByEnrollmentId(auth.getUsername());
        if (student.isPresent()) {
            String md5_pass = MD5.getHash(auth.getPassword());
            if (student.get().getPassword().equals(md5_pass)) {
                // set session
                // update last login

              httpServletResponse.setHeader("Location", "http://localhost:4200/reset-password");
              httpServletResponse.setStatus(302);
               return "redirect:localhost:4200/student";

            } else
                return "You have entered incorrect password";
        } else {
            return "You are not registered with the system. Please signup first";
        }
    }
  }
}

Answer 1

Do not add @CrossOrigin(origins = "*") annotation to controller.

Assume your api runs on 8080 and your angular code on 4200. If true;

create a file called proxy.conf.json

{
"/api/": {
    "target": "http://localhost:8080/",
    "secure": false,
    "changeOrigin": true
}

Start angular app using this command

ng serve --proxy-config proxy.conf.json

With this configuration when you call localhost:4200/api you it will call 8080 and it won't have any CORS error

Answer 2

Why don't you return a proper API Response and code and depending on your response and Code you can redirect on the front end.

It makes your API Completely RESTFUL. I hope this helps.