Dell S3048-ON Configuration Manual page 59

However, these changes are backward-compatible and do not affect existing behavior; meaning, you can still use the ip http source-
interface command to communicate with a particular interface even if no VRF is configured on that interface
NOTE: If the HTTP service is not VRF-aware, then it uses the global routing table to perform the look-up.
To enable an HTTP client to look up the VRF table corresponding to either management VRF or any nondefault VRF, use the ip http
vrf command in CONFIGURATION mode.
• Configure an HTTP client with a VRF that is used to connect to the HTTP server.
CONFIGURATION MODE
Dell(conf)#ip http vrf {management | <vrf-name>}
Getting Started 59