In SAP Fiori launchpad, you can call OData services on different systems.
For example, this is necessary for catalog federation or if specific OData services need to be called on a system different from the SAP Fiori launchpad front-end server. To achieve this, URLs for OData service calls are enriched by a segment parameter o having the system on which the service is to be called as the value. This mechanism is as specified for the origin segment parameter by SAP Gateway.
The example URL https://host:port/sap/opu/odata/MY_SERVICE;o=SYS can thus be routed to the corresponding system.
if %{PATH} regimatch *;o=SYS* SetHeader x-sap-webdisp-target-sid <FOO> [break]
if %{PATH} regimatch *;o=OTHER* SetHeader x-sap-webdisp-target-sid <BAR> [break]
icm/HTTP/mod_<number> = PREFIX=/,FILE=modification_rule.txt