问在使用jsf登录facebook时，获取redirect_uri不是绝对的URI错误

EN

public void socialConnect() throws Exception {
    Properties props = System.getProperties();
    props.put("graph.facebook.com.consumer_key", "561379830565954");
    props.put("graph.facebook.com.consumer_secret", "883e8d729d0358b4040fbffa762d832d");
    props.put("graph.facebook.com.custom_permissions", "publish_stream,email,user_birthday,user_location,offline_access");
    SocialAuthConfig config = SocialAuthConfig.getDefault();
    config.load(props);
    manager = new SocialAuthManager();
    manager.setSocialAuthConfig(config);
    ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
    String successURL = externalContext.getRequestContextPath() + "/socialLoginSuccess.xhtml";
    String authenticationURL = manager.getAuthenticationUrl(providerID, successURL);
    FacesContext.getCurrentInstance().getExternalContext().redirect(authenticationURL);
}

{
  "error": {
    "message": "redirect_uri isn't an absolute URI. Check RFC 3986.",
    "type": "OAuthException",
    "code": 191
  }
}