HTTP conditional GET

[Igor Sysoev]

On Sat, Aug 01, 2009 at 09:11:15AM -0400, Meng wrote:

> Hello,
> 
> I have just test my website with bing's tools: http://www.microsoft.com/search/Tools/default.aspx
> The test result is
> 
> 
> 
> HTTP compression and conditional GET results
> 
>     URL: http://www.shijile.com
> 
>     HTTP status code: 200 OK
> 
>     HTTP conditional GET: not enabled for the date selected
>     HTTP compression enabled using gzip
> 
>     HTTP headers:
> 
>         Transfer-Encoding: chunked
>         Connection: keep-alive
>         Pragma: no-cache
>         Cache-Control: max-age=86400,private
>         Content-Type: text/html
>         Date: Sat, 01 Aug 2009 12:57:43 GMT
>         Expires: Sun, 02 Aug 2009 12:57:43 GMT
>         Set-Cookie: PHPSESSID=e86i00j7mn1f88jm6mqlogjqd6; path=/
>         Server: nginx/0.7.61
>         X-Powered-By: PHP/5.1.6
>         Content-Encoding: gzip
> 
> 
> For more information
> Find the information you need to enhance your website with HTTP compression and conditional GET:
> Blog: Announcing Crawler Improvements for bing
> Blog: Optimizing your very large site for search - Part 2
> Webmaster Center
> 
> 
> 
> I am curious about this info:  HTTP conditional GET not enabled. It is said that HTTP conditional GET will greatly improve the website performance.
> I have searched Nginx wiki and this forum but get no result for this feature. Is there any setting equivalent to enable HTTP conditional GET? Or Nginx will implement it in the future?

nginx supports supports If-Modified-Since header (conditional GET) for
static files. However, this response is generated by a backend script
(X-Powered-By: PHP/5.1.6) and the backend script should handle conditonal
GET.


-- 
Igor Sysoev
http://sysoev.ru/en/