If the two sites are on TLS, the ask for to website B will include the entire URL from web site A in the referer parameter on the ask for. And admin from web site B can retrieve it within the log information of server B.) g. case in point.com) https://uk-copyright-application-s42862.develop-blog.com/44917104/helping-the-others-realize-the-advantages-of-uk-copyright-application-service