[MOBY-dev] getting RDF resources in the compressed format

[Edward Kawas]

Okay,

I set up mod_deflate on my local linux installation and tried it out.

Some results:
Service instance RDF:
	Original size: 7052579bytes
	Compressed size: 305092bytes
	Savings: ~96%
Object RDF:
	Original size: 2864668 bytes
	Compressed size: 219478 bytes
	Savings: ~92%

I know that it is obvious that we will get big savings by compressing text
files ... The question was how to implement this ...

Here is what I did:
	1. enabled mod_deflate for apache
	This differs from installation to installation, but for me, running
ubuntu, all I had to do was create 2 sym links in /etc/apache2/mods-enabled/
for the files deflate.conf and deflate.load in /etc/apache2/mods-available.
	2. edit the conf file
	Again this differs, but what I did was edit deflate.conf and put the
following inside:

<IfModule mod_deflate.c>
	  # mime types to compress
        AddOutputFilterByType DEFLATE text/html text/plain text/xml
	  # support for older browsers
        BrowserMatch ^Mozilla/4 gzip-only-text/html
        BrowserMatch ^Mozilla/4\.0[678] no-gzip
        BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
        BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
</IfModule>


	3. I restarted apache

More doc available at http://httpd.apache.org/docs/2.0/mod/mod_deflate.html

Now when a request comes in with the header 'Accept-Encoding: gzip' apache
compresses the RDF.

Eddie

-----Original Message-----
From: moby-dev-bounces at lists.open-bio.org
[mailto:moby-dev-bounces at lists.open-bio.org] On Behalf Of Martin Senger
Sent: February-26-08 4:35 PM
To: Core developer announcements
Subject: Re: [MOBY-dev] getting RDF resources in the compressed format

Many thanks, Paul.

I believe the solution we agreed upon was that if the client sends an
> "Accept-encoding" HTTP header with x-gzip


Yes, that was what I vaguely remembered but was not sure about details.
[BTW, is there a way to search the whole biomoby email archive?]

How does client know what was sent from the server? Is is in the HTTP
Content-type header? If so, what mime-type should be there?

Eddie, it would be nice to have this feature implemented on the registry
site (so other registry providers can copy it, as well). Would you consider
it please?

Cheers,
Martin


-- 
Martin Senger
  email: martin.senger at gmail.com
             m.senger at cgiar.org
  skype: martinsenger
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