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From "Thomas" <tho...@jet.st>
Subject Re: Re[2]: xml compressing
Date Wed, 05 Sep 2001 13:43:04 GMT
I have been fiddling around alot with sending gzip compressed streams to a
browser.
and have the following info for anyone willing to experiment.

if/what compression algorithms a browser can deal with is stated in the
request header
"Accept-Encoding". values I have seen is "deflate" and "gzip".
NN4.06+, MSIE 4+ and NN6/Mozilla (M17+) accepts and automatically decodes an
incoming
gzipped HTML stream just fine, but ONLY if the server sends along appropiate
info about this.

Say you have some implementation that gzips up some data on the fly  and
wishes to send
a gzip-chunk to the browser, these three headers are crucial for the browser
to recognize
the stream as gzip.

Content-Length
Content-Encoding: gzip
Content-type: text/html

if the browser accepts gzipped data, and these three headers are set
correct, it'll work.
I have been serving gzip compressed HTML with my apache for over two years
now
and over a slow connection this is a real boost. A vanilla ASCII file can be
reduced with
80-90% of its original size. taking down a 65kB chunk to less than 5kB, is
that a save or what.

those interested in this should have a look at mod_gzip. Don't know how well
it co-ops with a
servlet engine, but its definitely worth a try if you'd ask me.



my 2 cents
Thomas.
___________________________________________________
 thomas.loo@jet.st  ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
 http://www.jet.st | http://www.saltstorm.net
________________________________S_a_l_t_s_t_o_r_m____



----- Original Message -----
From: "Morrison, John" <John.Morrison@uk.experian.com>
To: <cocoon-users@xml.apache.org>
Sent: Wednesday, September 05, 2001 3:08 PM
Subject: RE: Re[2]: xml compressing


> Whether browsers support compression (usually either gzip or zip I think)
is
> sent as part of the header of the request.  It is then up to the server to
> do any compression (of the supported type) it desires.
>
> To my knowledge:
>
> Apache httpd can compress it's output.
> TC 4 I think can (it's a filter applied after the content has been
> generated)
> C2 doesn't.  I _don't_ know if it's possible &/ desired.
>
> You can't compress the html+images though, only one thing at once as it
> t'were.
>
> Don't take what I say as gospel - I've been wrong before ;)
>
> J.
>
> > -----Original Message-----
> > From: java guru [mailto:javacocoon@yahoo.co.in]
> > Sent: Wednesday, 05 September 2001 2:01 pm
> > To: cocoon-users@xml.apache.org; Andrew Answer
> > Subject: Re: Re[2]: xml compressing
> >
> >
> > Hi.,
> >   Again., let me if i have mistaken anything..
> >
> > 1. When we are talking about html over internet, we
> > are talking about a server and a client(browser). You
> > only have control over your side(server side). You
> > DONT have control over the client(browser side).
> >
> > 2. Any compression mechanisms(let it be simple zip or
> > xmlppm) requires two operations, compression and
> > de-compression. And when you dont have control over
> > the client side., how can u make sure the compressed
> > docs gets de-compressed on the other end?. This can
> > only be possible when u have control over both sides
> > like B2B environment.
> >
> > 3. Now., again., if the kinda technique exists that
> > enable one to compress whole html along with images
> > and tables and send them over the network and there
> > exists a client browser which understands all these
> > and de-compress the stuff., then the internet world
> > would have been somewhere else...No kidding..
> >
> > Again., correct me if wrong...
> >
> >
> >  --- Andrew Answer <creator0@mail.ru> wrote: > Hi java
> > guru,
> > >
> > > Tuesday, September 04, 2001, 8:38:37 PM, you wrote:
> > >
> > > jg> Hi.,
> > > jg>   Correct me if wrong..
> > >
> > > jg> 1. The xml/xsl rendering in c2 is done on server
> > > side.
> > > jg> Then why do u need to compress the xml/xsp for
> > > client
> > > jg> side?
> > >
> > > But if i even generate HTML-files, anyway i want/can
> > > compress theirs for
> > > decrease traffic. I want to learn this aspect,
> > > because it's can be
> > > very useful for me. My pages are too large (many
> > > tables, texts,
> > > images - 50-60k)
> > >
> > > jg> 2. The xsp/sitemap precompilation process is in
> > > jg> faq..Please try it...
> > >
> > > Well, i do this.
> > >
> > > jg>  --- Andrew Answer <creator0@mail.ru> wrote: >
> > > Hello
> > > jg> cocoon-users,
> > > >>
> > > >>   I have some questions about C2 environment...
> > > >>
> > > >>   1. Anybody know can i compress my xml/xsp files
> > > >> before publishing it?
> > > >>   I want to use on-the-fly compressing util like
> > > >> XMLPPM
> > > >>   (http://sourceforge.net/projects/xmlppm).  It's
> > > >> can decrease my traffic.
> > > >>   Need i change MIME-type of HTTP header for
> > > >> automatic decompression
> > > >>   files on the user? May be i must change files
> > > >> extension?
> > > >>
> > > >>   2. Can I precompile my site into .class files
> > > for
> > > >> speed increasing?
> > > >>   How to do this?
> > > >>
> > > >> --
> > > >> Best regards,
> > > >>  Andrew
> > > >> mailto:creator0@mail.ru
> > > >>
> > > >>
> > > >>
> > > >>
> > > jg>
> > >
> > ---------------------------------------------------------------------
> > > >> Please check that your question has not already
> > > been
> > > >> answered in the
> > > >> FAQ before posting.
> > > >> <http://xml.apache.org/cocoon/faqs.html>
> > > >>
> > > >> To unsubscribe, e-mail:
> > > >> <cocoon-users-unsubscribe@xml.apache.org>
> > > >> For additional commands, e-mail:
> > > >> <cocoon-users-help@xml.apache.org>
> > > >>
> > >
> > > jg> =====
> > > jg> Thanks and have great day
> > > jg> srini
> > >
> > > jg>
> > >
> > ____________________________________________________________
> > > jg> Do You Yahoo!?
> > > jg> Send a newsletter, share photos & files, conduct
> > > polls, organize chat events. Visit http://in/
> > > groups.yahoo.com
> > >
> > >
> > >
> > >
> > > --
> > > Best regards,
> > >  Andrew
> > > mailto:creator0@mail.ru
> > >
> > >
> > >
> > >
> > ---------------------------------------------------------------------
> > > Please check that your question has not already been
> > > answered in the
> > > FAQ before posting.
> > > <http://xml.apache.org/cocoon/faqs.html>
> > >
> > > To unsubscribe, e-mail:
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> > > For additional commands, e-mail:
> > > <cocoon-users-help@xml.apache.org>
> > >
> >
> > =====
> > Thanks and have great day
> > srini
> >
> > ____________________________________________________________
> > Do You Yahoo!?
> > For regular News updates go to http://in.news.yahoo.com
> >
> > ---------------------------------------------------------------------
> > Please check that your question has not already been answered in the
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> >
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>
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