# If-Unmodified-Since **URL:** \ **Category:** NGINX\ **Created:** [December 2, 2010, 1:57am UTC](https://www.ruby-forum.com/t/if-unmodified-since/199962 "2010-12-02T01:57:18Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/77aa72/32.png) [@Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/u/Dobai-Pataky_BSSSSl)\ **Post date:** [December 2, 2010, 1:57am UTC](https://www.ruby-forum.com/t/if-unmodified-since/199962/1 "2010-12-02T01:57:18Z")
It appears from documentation and Googling that nginx supports the If-Modified-Since header but not the If-Unmodified-Since header; are there any plans to add support? Thanks, Jeff ---
**Author:** ![sithadmin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@sithadmin](https://www.ruby-forum.com/u/sithadmin)\ **Post date:** [December 2, 2010, 1:29pm UTC](https://www.ruby-forum.com/t/if-unmodified-since/199962/2 "2010-12-02T13:29:51Z")
On Wed, Dec 01, 2010 at 07:56:56PM -0500, Jeff M. wrote: > It appears from documentation and Googling that nginx supports the > If-Modified-Since header but not the If-Unmodified-Since header; are > there any plans to add support? nginx does not support If-Unmodified-Since. I believe it’s easy to add it, but are clients which support the header ? – Igor S. > **[Igor Sysoev](http://sysoev.ru/en/)** ---
**Author:** ![sithadmin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@sithadmin](https://www.ruby-forum.com/u/sithadmin)\ **Post date:** [December 2, 2010, 1:48pm UTC](https://www.ruby-forum.com/t/if-unmodified-since/199962/3 "2010-12-02T13:48:09Z")
On 12/02/2010 07:28 AM, Igor S. wrote: > On Wed, Dec 01, 2010 at 07:56:56PM -0500, Jeff M. wrote: > > > It appears from documentation and Googling that nginx supports the > > If-Modified-Since header but not the If-Unmodified-Since header; are > > there any plans to add support? > > nginx does not support If-Unmodified-Since. > I believe it’s easy to add it, but are clients which support the header ? I don’t know an exhaustive list, but I do know that cURL supports it, which means any program using it for downloads (lots) or using libcurl (lots) support it. urlib4 supports it as well. I believe wget does too. I would guess most dedicated downloaders/download accelerators also support it. Thanks, Jeff ---
**Author:** ![sithadmin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@sithadmin](https://www.ruby-forum.com/u/sithadmin)\ **Post date:** [December 2, 2010, 3:44pm UTC](https://www.ruby-forum.com/t/if-unmodified-since/199962/4 "2010-12-02T15:44:55Z")
On Thu, Dec 02, 2010 at 03:28:27PM +0300, Igor S. wrote: > On Wed, Dec 01, 2010 at 07:56:56PM -0500, Jeff M. wrote: > > > It appears from documentation and Googling that nginx supports the > > If-Modified-Since header but not the If-Unmodified-Since header; are > > there any plans to add support? > > nginx does not support If-Unmodified-Since. > I believe it’s easy to add it, but are clients which support the header ? The attached patch adds If-Unmodified-Since support. ---
**Author:** ![sithadmin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@sithadmin](https://www.ruby-forum.com/u/sithadmin)\ **Post date:** [December 2, 2010, 5:53pm UTC](https://www.ruby-forum.com/t/if-unmodified-since/199962/5 "2010-12-02T17:53:35Z")
On 12/2/2010 9:43 AM, Igor S. wrote: > The attached patch adds If-Unmodified-Since support. Cool! Any chance we’ll see an official 0.8.54 release with this applied? Thanks, Jeff ---
**Author:** ![sithadmin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@sithadmin](https://www.ruby-forum.com/u/sithadmin)\ **Post date:** [December 2, 2010, 6:23pm UTC](https://www.ruby-forum.com/t/if-unmodified-since/199962/6 "2010-12-02T18:23:45Z")
On Thu, Dec 02, 2010 at 11:52:20AM -0500, Jeff M. wrote: > > > I believe it’s easy to add it, but are clients which support the header ? > > > > The attached patch adds If-Unmodified-Since support. > > Cool! > > Any chance we’ll see an official 0.8.54 release with this applied? It will be in the next 0.9.2, and then probably on December 13 or 20 in 0.8.54. – Igor S. > **[Igor Sysoev](http://sysoev.ru/en/)**