3.21.2

• deps: connect@2.30.2
  • deps: body-parser@~1.13.3
  • deps: compression@~1.5.2
  • deps: errorhandler@~1.4.2
  • deps: method-override@~2.3.5
  • deps: serve-index@~1.7.2
  • deps: type-is@~1.6.6
  • deps: vhost@~3.0.1
• deps: vary@~1.0.1
  • Fix setting empty header from empty field
  • perf: enable strict mode
  • perf: remove argument reassignments