Unicorn 4.2.1 - Rack HTTP server for fast clients and Unix

Unicorn is an HTTP server for Rack applications designed to only serve
fast clients on low-latency, high-bandwidth connections and take
advantage of features in Unix/Unix-like kernels. Slow clients should
only be served by placing a reverse proxy capable of fully buffering
both the the request and response in between Unicorn and slow clients.


  • Stale pid files are detected if a pid is recycled by processes
    belonging to another user, thanks to Graham Bleach.
  • nginx example config updates thanks to to Eike Herzbach.
  • KNOWN_ISSUES now documents issues with apps/libs that install
    conflicting signal handlers.