Events like below are seen inside the var/log/vmware/applmgmt/localhost_access_log of the vCenter Server Appliance.Request: GET /apigw/ws HTTP/1.1 | Status:
VMware vCenter Server
VMware vSphere Cloud Foundation
Apigw is like a gateway to access an extensive set of internal APIs' which have their own set of responses. The log "Request: GET /apigw/ws HTTP/1.1" confirms an internal API call reaching out to a web socket of another internal component.
These log entries and various other similar API calls invocations are expected to be seen as a part of various internal operations.