Oauth callback into several service instances

We're using 3 service instances under a load balencer.

In order to create an oauth session, we're using two endpoints:

The first one is named `/start`. We are using this code:

DbxAppInfo appInfo = new DbxAppInfo("---", "---");
DbxRequestConfig config = new DbxRequestConfig("---");
DbxWebAuth webAuth = new DbxWebAuth(config, appInfo);
        
HttpSession session = request.getSession(true);
String sessionKey = "dropbox-auth-csrf-token";
DbxSessionStore csrfTokenStore = new DbxStandardSessionStore(session, sessionKey);
        
String redirectUri = "http://localhost:8080/dropbox/cmng/dropbox/finish";
DbxWebAuth.Request authRequest = DbxWebAuth.newRequestBuilder()
        .withRedirectUri(redirectUri, csrfTokenStore).build();
        
String authorizeUrl = webAuth.authorize(authRequest);
//redirect to just created 'authorizeUrl'

Shortly, we're creating a new url with our redirectURI.

The last one is named `/finish`. We are using this code:

DbxAppInfo appInfo = new DbxAppInfo("---", "---");
DbxRequestConfig config = new DbxRequestConfig("---");
DbxWebAuth webAuth = new DbxWebAuth(config, appInfo);
        
HttpSession session = request.getSession(true);
String sessionKey = "dropbox-auth-csrf-token";
DbxSessionStore csrfTokenStore = new DbxStandardSessionStore(session, sessionKey);
        
String redirectUri = "http://localhost:8080/dropbox/cmng/dropbox/finish";
DbxAuthFinish authFinish;
      
authFinish = webAuth.finishFromRedirect(redirectUri, csrfTokenStore, request.getParameterMap());
        
String accessToken = authFinish.getAccessToken();

We don't know how this code will behave when a first request to `/start` is handled by one server instance and the callback to `/finish` is handle by another server instance.

How would it behave?