IN the network.log currently we don't have in/out messages from the components that use REST interface, namely, AAI, SO, PDP-X GUARD, and VFC. The work would be at the point where we send or receive a network http message from those components, to log it in the network.log. 

Reference:

https://git.onap.org/policy/drools-pdp/tree/policy-endpoints/src/main/java/org/onap/policy/drools/event/comm/bus/internal/SingleThreadedBusTopicSource.java - line 250

https://git.onap.org/policy/drools-pdp/tree/policy-endpoints/src/main/java/org/onap/policy/drools/event/comm/bus/internal/InlineBusTopicSink.java - line 150

Note that the logger that is used in the declaration

private static final Logger netLogger = LoggerFactory.getLogger(NETWORK_LOGGER);

to point to the network.log