4.15.0

• Add debug message when loading view engine
• Add next("router") to exit from router
• Fix case where router.use skipped requests routes did not
• Remove usage of res._headers private field
  • Improves compatibility with Node.js 8 nightly
• Skip routing when req.url is not set
• Use %o in path debug to tell types apart
• Use Object.create to setup request & response prototypes
• Use setprototypeof module to replace __proto__ setting
• Use statuses instead of http module for status messages
• deps: debug@2.6.1
  • Allow colors in workers
  • Deprecated DEBUG_FD environment variable set to 3 or higher
  • Fix error when running under React Native
  • Use same color for same namespace
  • deps: ms@0.7.2
• deps: etag@~1.8.0
  • Use SHA1 instead of MD5 for ETag hashing
  • Works with FIPS 140-2 OpenSSL configuration
• deps: finalhandler@~1.0.0
  • Fix exception when err cannot be converted to a string
  • Fully URL-encode the pathname in the 404
  • Only include the pathname in the 404 message
  • Send complete HTML document
  • Set Content-Security-Policy: default-src 'self' header
  • deps: debug@2.6.1
• deps: fresh@0.5.0
  • Fix false detection of no-cache request directive
  • Fix incorrect result when If-None-Match has both * and ETags
  • Fix weak ETag matching to match spec
  • perf: delay reading header values until needed
  • perf: enable strict mode
  • perf: hoist regular expressions
  • perf: remove duplicate conditional
  • perf: remove unnecessary boolean coercions
  • perf: skip checking modified time if ETag check failed
  • perf: skip parsing If-None-Match when no ETag header
  • perf: use Date.parse instead of new Date
• deps: qs@6.3.1
  • Fix array parsing from skipping empty values
  • Fix compacting nested arrays
• deps: send@0.15.0
  • Fix false detection of no-cache request directive
  • Fix incorrect result when If-None-Match has both * and ETags
  • Fix weak ETag matching to match spec
  • Remove usage of res._headers private field
  • Support If-Match and If-Unmodified-Since headers
  • Use res.getHeaderNames() when available
  • Use res.headersSent when available
  • deps: debug@2.6.1
  • deps: etag@~1.8.0
  • deps: fresh@0.5.0
  • deps: http-errors@~1.6.1
• deps: serve-static@1.12.0
  • Fix false detection of no-cache request directive
  • Fix incorrect result when If-None-Match has both * and ETags
  • Fix weak ETag matching to match spec
  • Remove usage of res._headers private field
  • Send complete HTML document in redirect response
  • Set default CSP header in redirect response
  • Support If-Match and If-Unmodified-Since headers
  • Use res.getHeaderNames() when available
  • Use res.headersSent when available
  • deps: send@0.15.0
• perf: add fast match path for * route
• perf: improve req.ips performance