Securing HTTP(S) Connections to the SLD 
HTTP is the primary communication protocol that is used for exchanging data with the SLD. This applies to communication routes between:
Web-based UI and the SLD server (see Configuring the Use of SSL on the AS Java)
SLD Data Suppliers and the SLD bridge
SLD bridge that distributes system data and the remote SLD server
Recommendation
To secure these communication routes, we recommend that you use HTTPS.
To supply data to the SLD that originates from a system other than a AS Java or AS ABAP system, the executable sldreg is used. The sldreg sends data in XML format using a predefined DTD. For this purpose, it uses an HTTP connection, as shown in the figure below:

For example, TREX, SAPOSCOL, generate this type of XML and register themselves at SLD using sldreg.
For more information on sldreg, see SAP Note 733476.