Embedding metabase using java

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I followed the instructions for embedding an interactive Metabase dashboard from this link, and I wrote a Java/Spring microservice following the instructions. Here's the code:

@GetMapping("/ssometabase")
  public void ssoToMetabase(HttpServletResponse response, @RequestParam(required = false) String return_to)
      throws IOException {
    String email = "user@example.com";  /
    String firstName = "John";
    String lastName = "Doe";
    User user = new User();
    user.setEmail(email);
    user.setFirstName(firstName);
    user.setLastName(lastName);
    String token = jwtService.signToken(user);
    String redirectUrl = metabaseUrl + "/auth/sso?jwt=" + token;

    if (return_to != null) {
      redirectUrl += "&return_to=" + URLEncoder.encode(return_to, StandardCharsets.UTF_8.toString());
    }
    System.out.println(redirectUrl);
    response.sendRedirect(redirectUrl);
  }

  @GetMapping("/analytics")
  public void showAnalytics(HttpServletRequest request, HttpServletResponse response) throws IOException {
    String METABASE_DASHBOARD_PATH = "/dashboard/3?tab=7-circulation";
    String iframeUrl = "/ssometabase?return_to=" + METABASE_DASHBOARD_PATH;

    String html = "<iframe src=\"" + iframeUrl
        + "\" frameborder=\"0\" width=\"1280\" height=\"600\" allowtransparency=\"true\"></iframe>";
    response.setContentType("text/html");
    response.getWriter().write(html);
  }

I followed the instructions for embedding an interactive Metabase dashboard from this link, and I wrote a Java/Spring microservice following the instructions. Here's the code:

@GetMapping("/ssometabase")
  public void ssoToMetabase(HttpServletResponse response, @RequestParam(required = false) String return_to)
      throws IOException {
    String email = "user@example.com";  /
    String firstName = "John";
    String lastName = "Doe";
    User user = new User();
    user.setEmail(email);
    user.setFirstName(firstName);
    user.setLastName(lastName);
    String token = jwtService.signToken(user);
    String redirectUrl = metabaseUrl + "/auth/sso?jwt=" + token;

    if (return_to != null) {
      redirectUrl += "&return_to=" + URLEncoder.encode(return_to, StandardCharsets.UTF_8.toString());
    }
    System.out.println(redirectUrl);
    response.sendRedirect(redirectUrl);
  }

  @GetMapping("/analytics")
  public void showAnalytics(HttpServletRequest request, HttpServletResponse response) throws IOException {
    String METABASE_DASHBOARD_PATH = "/dashboard/3?tab=7-circulation";
    String iframeUrl = "/ssometabase?return_to=" + METABASE_DASHBOARD_PATH;

    String html = "<iframe src=\"" + iframeUrl
        + "\" frameborder=\"0\" width=\"1280\" height=\"600\" allowtransparency=\"true\"></iframe>";
    response.setContentType("text/html");
    response.getWriter().write(html);
  }

The problem is that when I call the /analytics endpoint, it returns an iframe and then constantly calls the /ssometabase endpoint in an infinite loop. I don't know what is causing this. For the JWT provider URI in the Metabase configuration, I set it to http://localhost:8080/ssometabase, enabled embedding, and generated a token using the secret key with this method :

public String signToken(User user){
    Map<String, Object> claims = new HashMap<>();
    claims.put("email", user.getEmail());
    claims.put("first_name", user.getFirstName());
    claims.put("last_name", user.getLastName());
    Date now = new Date();
    long expirationTime = now.getTime() + 1000 * 60 * 10; 

    return Jwts.builder()
        .setClaims(claims)
        .setExpiration(new Date(expirationTime))
        .signWith(SignatureAlgorithm.HS256, secretKey.getBytes())
        .compact();
  }

When I go to the redirect URL printed in the console, I can see the dashboard. Any help is welcome Embedding metabase using java