gzip gzip_min_length directives doesn't work in ajax?

[Maxim Dounin]

Hello!

On Sun, Jun 24, 2012 at 04:54:28PM +0800, lhmwzy wrote:

>  I have the following conf
> 
> http {
> ...
>     gzip on;
>     gzip_min_length 1000;
>     gzip_buffers 16 64k;
>     gzip_http_version 1.1;
>     gzip_comp_level 6;
>     gzip_types text/plain application/x-javascript text/css application/xml;
>     gzip_vary on;
> ...
> 
> I notice that the gzip_min_length 1000; dirctives doesn't word in ajax.
> 
> the request header:
> 
> Host	10.66.23.99
> Accept-Charset	GB2312,utf-8;q=0.7,*;q=0.7
> (Request-Line)	GET /luapp/getname?query=dsfds HTTP/1.1
> Accept-Encoding	gzip, deflate
> Connection	keep-alive
> User-Agent	Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101
> Firefox/5.0
> Cookie	name=bq0xPMS+HUgGYuV7pB9f9j6l9qhcIdS3fABQDOlgsuY=;
> returnurl=/app/images/shadow.png
> Accept	text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
> Accept-Language	zh-cn,zh;q=0.5
> 
> the response header:
> (Status-Line)	HTTP/1.1 200 OK
> Connection	keep-alive
> Content-Encoding	gzip
> Content-Type	text/html; charset=UTF-8
> Date	Sun, 24 Jun 2012 08:37:05 GMT
> Server	ngx_openresty/1.2.1.1
> Transfer-Encoding	chunked
> Vary	Accept-Encoding
> 
> the url:http://10.66.23.99/luapp/getname?query=dsfds
> the return content:
> {"query":"dsfds","suggestions":{}}
> the size of return content is 35bytes,is smaller than gzip_min_length
> in the conf,but it is still gziped,
> the gzip resut:text/html; charset=UTF-8 : 35 bytes, gzip compressed to
> 55 bytes ( -57.1 % saving )
> 
> Why?
> I'm using nginx 1.2.1

The gzip_min_length directive doesn't work if length isn't known.

Maxim Dounin