Forum OpenACS Q&A: Re: Res: Re: Res: Re: How to enable gzip compression

5: Re: Res: Re: Res: Re: How to enable gzip compression (response to 4)

Posted by Héctor Romojaro on 10/29/07 11:31 AM

Gzipped pages, as shown on rfc should have the following output header:

Content-Encoding: gzip

There is a list of the Browser and Output Headers in developer support pages, so i just expected to see that header there.
There is also a firefox extension to check the headers too.

I've tested the pages with external checks too, like the one I posted before (there are a lot of them) and checked the size of the page with the module nszlib enabled and disabled, but, to be really really sure if it is compressing or not, i did a tcpdump to the net interface of the client:

$ tcpdump -A src $URL -s 3000 > /tmp/dump

Examining the /tmp/dump file, I could see clearly the html plain code, so aolserver it's surely not compressing.

Anybody is using successfully gzip compression with aolserver 4.5 + openacs/dotlrn? Any tips?

6: Re: Res: Re: Res: Re: How to enable gzip compression (response to 5)

Posted by Tom Jackson on 10/29/07 04:07 PM

Thanks for the link to the firefox plugin.

I have visited several websites, the browser is sending the gzip/deflate header, but nobody returns compressed content. Do you have any links to sites which do that?

7: Re: Res: Re: Res: Re: Res: Re: How to enable gzip compression (response to 6)

Posted by Héctor Romojaro on 10/29/07 08:36 PM

Yes, www.mozilla.org is doing it, for example:



----------------------------------

http://www.mozilla.org/GET / HTTP/1.1
Host: www.mozilla.org
User-Agent: Mozilla/5.0 (X11; U; Linux i686; es-ES; rv:1.8.1) Gecko/20061010 Firefox/2.0
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: es-es,es;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
HTTP/1.x 200 OK
Age: 449
Date: Mon, 29 Oct 2007 19:25:01 GMT
Expires: Mon, 29 Oct 2007 19:35:01 GMT
Cache-Control: max-age=600
Connection: Keep-Alive
Via: NS-CACHE-6.1:   1
Etag: "2b5a-cc8b36c0"
Server: Apache/2.0.52 (Red Hat)
Last-Modified: Thu, 25 Oct 2007 20:08:35 GMT
Accept-Ranges: bytes
Content-Type: text/html
Content-Encoding: gzip
Content-Length: 3068

----------------------------------
That's the data from the headers given by the firefox plugin.

8: Re: Res: Re: Res: Re: Res: Re: How to enable gzip compression (response to 7)

Posted by Hamilton Chua on 01/24/08 08:29 AM

Hello Hector,

I would like to ask if you were successful with enabling gzip compression on your server.

I've been playing with nszlib in the past couple of days and like you I have been unable to get aolserver 4.5 to server gzip content.

However, I found that if I remove 0-acs-init.tcl and zz-postload.tcl from openacs/tcl/ aolserver ns_zlib works.

I'm guessing that it must be something in acs-init that is overriding ns_zlib.

I'm trying to trace acs-init now with the hopes of pin pointing exactly what is preventing compressed content and I was wondering if you have had any luck.

Thanks,

Hamilton

9: Re: Res: Re: Res: Re: Res: Re: Res: Re: How to enable gzip compression (response to 8)

Posted by Héctor Romojaro on 01/24/08 11:12 AM

Hello Hamilton,

No, I couldn't, but i did a workaround using nginx to serve the pages in top of aolserver, as seen in malte's tutorial.

Now, nginx is doing gzip compression, ssl negotiation and serving static content (css, js, images...).

BTW, aolserver without ssl didn't restart with signal 11 errors anymore.

Greetings, Héctor