2412621 - Unable to load groups on Fiori Launchpad with error "Invalid URI segment 'PageSets(''"

While accessing Fiori Launchpad from internet with Reverse Proxy, you get error "Failure - Unable to load groups" and in the HTTP trace you get error "400 Bad Request" for the following request:

~/sap/opu/odata/UI2/PAGE_BUILDER_PERS/PageSets('%2FUI2%2FFiori2LaunchpadHome')?$expand=Pages/PageChipInstances/Chip/ChipBags/ChipProperties,Pages/PageChipInstances/RemoteCatalog,Pages/PageChipInstances/ChipInstanceBags/ChipInstanceProperties,AssignedPages,DefaultPage

In the response of the request, you can see message: Invalid URI segment 'PageSets(''

However, if you use intranet (without any Reverse Proxy), the Fiori Launchpad can be loaded properly.

• SAP Fiori Launchpad
• Gateway

Reverse Proxy, encode, decode, pagesets, UI2, #SAPFLP, #SAPFiori, gateway, error_log , KBA , CA-UI2-INT-BE , Please use CA-FLP-ABA , OPU-GW-COR , Framework , Problem