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# Release Change Log

4.15.3 - Release date: 2017-05-16

{: id="4.15.3"}

The 4.15.3 patch release including some minor bug fixes:

• Fix error when `res.set` cannot add charset to `Content-Type`.
• Fix missing `</html>` in HTML document.

For a complete list of changes in this release, see History.md.

4.15.2 - Release date: 2017-03-06

{: id="4.15.2"}

The 4.15.2 patch release including a minor bug fix:

• Fix regression parsing keys starting with `[` in the extended (default) query parser.

For a complete list of changes in this release, see History.md.

4.15.1 - Release date: 2017-03-05

{: id="4.15.1"}

The 4.15.1 patch release including a minor bug fix:

• Fix compatibility issue when using the datejs 1.x library where the [`express.static()` middleware](/{{ page.lang }}/4x/api.html#express.static) and [`res.sendFile()` method](/{{ page.lang }}/4x/api.html#res.sendFile) would incorrectly respond with 412 Precondition Failed.

For a complete list of changes in this release, see History.md.

4.15.0 - Release date: 2017-03-01

{: id="4.15.0"}

The 4.15.0 minor release includes bug fixes, performance improvements, and other minor feature additions, including:

• Starting with this version, Express supports Node.js 7.x.
• The [`express.static()` middleware](/{{ page.lang }}/4x/api.html#express.static) and [`res.sendFile()` method](/{{ page.lang }}/4x/api.html#res.sendFile) now support the `If-Match` and `If-Unmodified-Since` request headers.
• Update to [jshttp/etag module](https://www.npmjs.com/package/etag) to generate the default ETags for responses which work when Node.js has [FIPS-compliant crypto enabled](https://nodejs.org/dist/latest/docs/api/cli.html#cli_enable_fips).
• Various auto-generated HTML responses like the default not found and error handlers will respond with complete HTML 5 documents and additional security headers.

For a complete list of changes in this release, see History.md.

4.14.1 - Release date: 2017-01-28

{: id="4.14.1"}

The 4.14.1 patch release includes bug fixes and performance improvements, including:

• Update to [pillarjs/finalhandler module](https://www.npmjs.com/package/finalhandler) fixes an exception when Express handles an `Error` object which has a `headers` property that is not an object.

For a complete list of changes in this release, see History.md.

4.14.0 - Release date: 2016-06-16

{: id="4.14.0"}

The 4.14.0 minor release includes bug fixes, security update, performance improvements, and other minor feature additions, including:

• Starting with this version, Express supports Node.js 6.x.
• Update to [jshttp/negotiator module](https://www.npmjs.com/package/negotiator) fixes a [regular expression denial of service vulnerability](https://npmjs.com/advisories/106).
• The [`res.sendFile()` method](/{{ page.lang }}/4x/api.html#res.sendFile) now accepts two new options: `acceptRanges` and `cacheControl`.

  • acceptRanges (defaut is true), enables or disables accepting ranged requests. When disabled, the response does not send the Accept-Ranges header and ignores the contents of the Range request header.

  • cacheControl, (default is true), enables or disables the Cache-Control response header. Disabling it will ignore the maxAge option.

  • res.sendFile has also been updated to handle Range header and redirections better.

• The [`res.location()` method](/{{ page.lang }}/4x/api.html#res.location) and [`res.redirect()` method](/{{ page.lang }}/4x/api.html#res.redirect) will now URL-encode the URL string, if it is not already encoded.
• The performance of the [`res.json()` method](/{{ page.lang }}/4x/api.html#res.json) and [`res.jsonp()` method](/{{ page.lang }}/4x/api.html#res.jsonp) have been improved in the common cases.
• The [jshttp/cookie module](https://www.npmjs.com/package/cookie) (in addition to a number of other improvements) has been updated and now the [`res.cookie()` method](/{{ page.lang }}/4x/api.html#res.cookie) supports the `sameSite` option to let you specify the [SameSite cookie attribute](https://tools.ietf.org/html/draft-west-first-party-cookies-07).

  {% include admonitions/note.html content="This attribute has not yet been fully standardized, may change in the future, and many clients may ignore it."%}

  The possible value for the sameSite option are:

  • true, which sets the SameSite attribute to Strict for strict same site enforcement.
  • false, which does not set the SameSite attribute.
  • 'lax', which sets the SameSite attribute to Lax for lax same site enforcement.
  • 'strict', which sets the SameSite attribute to Strict for strict same site enforcement.
• Absolute path checking on Windows, which was incorrect for some cases, has been fixed.
• IP address resolution with proxies has been greatly improved.
• The [`req.range()` method](/{{ page.lang }}/4x/api.html#req.range) options object now supports a `combine` option (`false` by default), which when `true`, combines overlapping and adjacent ranges and returns them as if they were specified that way in the header.

For a complete list of changes in this release, see History.md.