3.9.0

• custom etag control with app.set('etag', val)
  • app.set('etag', function(body, encoding){ return '"etag"' }) custom etag generation
  • app.set('etag', 'weak') weak tag
  • app.set('etag', 'strong') strong etag
  • app.set('etag', false) turn off
  • app.set('etag', true) standard etag
• Include ETag in HEAD requests
• mark res.send ETag as weak and reduce collisions
• update connect to 2.18.0
  • deps: compression@1.0.3
  • deps: serve-index@1.1.0
  • deps: serve-static@1.2.0
• update send to 0.4.0
  • Calculate ETag with md5 for reduced collisions
  • Ignore stream errors after request ends
  • deps: debug@0.8.1