puma/puma v3.9.0

3.9.0 - "Private Caller"

on GitHub

2 features:

• The ENV is now reset to its original values when Puma restarts via USR1/USR2 (#1260) (MRI only, no JRuby support)
• Puma will no longer accept more clients than the maximum number of threads. (#1278)

9 bugfixes:

• Reduce information leakage by preventing HTTP parse errors from writing environment hashes to STDERR (#1306)
• Fix SSL/WebSocket compatibility (#1274)
• HTTP headers with empty values are no longer omitted from responses. (#1261)
• Fix a Rack env key which was set to nil. (#1259)
• peercert has been implemented for JRuby (#1248)
• Fix port settings when using rails s (#1277, #1290)
• Fix compat w/LibreSSL (#1285)
• Fix restarting Puma w/symlinks and a new Gemfile (#1282)
• Replace Dir.exists? with Dir.exist? (#1294)

1 known issue:

• A bug in MRI 2.2+ can result in IOError: stream closed. See #1206. This issue has existed since at least Puma 3.6, and probably further back.