About the HTTP/HTTPS Proxy Policy
Beginning with release 5.2(1), you can configure the HTTP or HTTPS proxy address on Cisco Application Policy Infrastructure
Controller (APIC) for features that need Internet access. In addition to Cisco APIC features that automatically use the configured proxy addresses, the surrounding ecosystems of the Cisco APIC can also query the object proxyServer
on the Cisco APIC so that the ecosystems can use the same proxy server as the Cisco APIC without needing you to configure the proxy information on multiple platforms.
The HTTP/HTTPS proxy policy itself does not control nor alter the management network (out-of-band or in-band) that each Cisco APIC feature uses. You can specify the management network setting in the Cisco APIC Connectivity Preferences. For more information, see the "Adding Management Access" section in the "Management" chapter of the Cisco APIC Basic Configuration Guide.