more efficient server handling

[edwardcapriolo]

Please do a quick search on GitHub issues first, the feature you are about to request might have already been requested.

Expected Behavior

Efficient correct HTTP
bad user data should return 400

Current Behavior

Bad data returns 5xx
Extrac copies of JSON messages are created in memory

Context

More memory pressure,
harder to debug

[edwardcapriolo]

Hello. Do you mind giving this a look. I am on vacation this week so if you want to get some cleanups out of me this is the week :)

[edwardcapriolo]

Third rebase as others include fixes inside this PR. Please have a look thank you.