Fix duplicate fetches and 502s on concurrent cache misses - #329

Fix duplicate fetches and 502s on concurrent cache misses#329

montehurd wants to merge 2 commits into

git-pkgs:maingit-pkgs/proxy:mainfrom

montehurd:coalesce-concurrent-cache-missesmontehurd/proxy:coalesce-concurrent-cache-missesCopy head branch name to clipboard