For transparency all outgoing PA network requests (trusted server calls, bidding & scoring scripts) should be fully visible in the DevTools window in particular the Network tab. When PA API is fully rolled out it is generally the first thing users look at to be able to detect wrong behaviors like requests taking too long or too many outgoing requests.

Currently it is only visible in the Performance tab (which doesn't give the full view as one can't see HTTP headers for example) or via external Chrome extensions (which most users have not installed)

Related to ticket #499