php设置curl gzip,curl 可以看到能输出gzip 但是在浏览器下却没有输出

环境 nginx + php-fpm

curl -v -I -H "Accept-Encoding: gzip,deflate" http://www.ihezhu.com/* About to connect() to www.ihezhu.com port 80 (#0)

* Trying 210.51.54.180... connected

> HEAD / HTTP/1.1

> User-Agent: curl/7.22.0 (i686-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3

> Host: www.ihezhu.com

> Accept: */*

> Accept-Encoding: gzip,deflate

>

< HTTP/1.1 200 OK

HTTP/1.1 200 OK

< Server: nginx

Server: nginx

< Date: Fri, 18 Jan 2013 10:13:19 GMT

Date: Fri, 18 Jan 2013 10:13:19 GMT

< Content-Type: text/html; charset=utf-8

Content-Type: text/html; charset=utf-8

< Connection: keep-alive

Connection: keep-alive

< Vary: Accept-Encoding

Vary: Accept-Encoding

< Set-Cookie: PHPSESSID=i6nkkd79n7uenikq2727u8rln6; path=/

Set-Cookie: PHPSESSID=i6nkkd79n7uenikq2727u8rln6; path=/

< Expires: Thu, 19 Nov 1981 08:52:00 GMT

Expires: Thu, 19 Nov 1981 08:52:00 GMT

< Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0

Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0

< Pragma: no-cache

Pragma: no-cache

< Content-Encoding: gzip

Content-Encoding: gzip

* no chunk, no close, no size. Assume close to signal end

<

* Closing connection #0

但直接浏览器却没有看到输出Content-Encoding 大概怎么回事?

谢谢

====update

原因暂时还不明, 说下我做的测试

用fiddler访问, 不输出

用fiddler按照curl构造参数, 不输出

用chrome插件模拟curl请求, 不输出

在本机模拟了服务器配置一致的环境(php.ini, fastcgi, nginx.conf以及站点配置), 可以输出

现在准备在curl中模拟browser的请求, 看看怎样