If it is related to dcm4chee you'll information
here when the URL start by jnlp://
However, with the future release 3.5 (in March), Weasis will be installed as a native application for all the users on Windows, Mac and Linux (embedding a custom JDK, shortcuts, registring dicom file association and a URI handler). So from a web context, Weasis will be launched directly by weasis:// without Java Web Start (removed from Java 11). This will not change significantly the integration from a web context but it will improve the launch time and brings new API for storing the user preferences remotely and for handling the configuration at the server side.