Hi Mohammed Amine
I will assist where possible but will be through the SCN platform as it allows for other members to contribute too as and where they see fit.
Regarding the HTTP connection, I would suggest that you test out the connection first via the "Test Outbound Connection" functionality as described in the following blog.
HCI: Testing Outbound Connections from HCI
If you have issues with the connectivity that you can't resolve, I'd suggest you open a call with the HCI team as mentioned in item 12 of the following blog.
SAP HCI - Security FAQ and Checklist!
Regards
Eng Swee