Collect more info in proxy connect event
Collect more info in proxy connect event

Summary: Add proxy_response_body field

Reviewed By: mzlee

Differential Revision: D2697638

fb-gh-sync-id: 625a87a78712b95c8c34e9c4c13be035d2426e08

Orvid/proxygen,Orvid/proxygen,LilMeyer/proxygen,LilMeyer/proxygen,LilMeyer/proxygen,LilMeyer/proxygen,Orvid/proxygen,Orvid/proxygen