Solution : https://service.sap.com/sap/support/notes/837479 (SAP Service marketplace login required)
Key words :
concatenate '/sap/bc/notify/polling' '/' _c_generic_key '/' 'notify, forms communication channel work modes, code <% class cl_icf_notify_polling definition load, <% class cl_icf_notify_polling definition load, open bsp application 'sam_notifying', simple abap messaging applet, _c_polling_applet_arch_url = cl_icf_notify_polling=>get_polling_applet_archive_url, broadcast messaging reason, 0 service industry extension, configured ic webclient
Related Notes :
| 885542 | Messaging does not work with Web Dispatcher (Part 2) |