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From "Jorge Medina" <jmed...@e-dialog.com>
Subject RE: [users@httpd] Application design
Date Fri, 20 Mar 2009 15:20:56 GMT
But I would argue that disk space is cheaper than decompressing files on the server for every
request. 8-) 

-----Original Message-----
From: Brian Mearns [mailto:mearns.b@gmail.com] 
Sent: Friday, March 20, 2009 11:17 AM
To: users@httpd.apache.org; aw@ice-sa.com
Subject: Re: [users@httpd] Application design

On Fri, Mar 20, 2009 at 10:46 AM, André Warnier <aw@ice-sa.com> wrote:
> Hi.
>
> For once, I'd like to pump the collective knowledge and accumulated 
> wisdom of the gurus on the list.
>
> I run a document management application, from which users can retrieve 
> documents (ms-office, pdf, etc..) through a web application.  From the 
> user point of view, documents are accessed via a "logical id", such as 
> "12345678", via a link like "http://servername/getdoc/1234567".
> An active module on the server processes these requests, determines 
> for example that "12345678" corresponds to some document 
> "doc0001.pdf", retrieves this document, and returns it to the user 
> with the appropriate HTTP headers, for example in this case :
> Content-Type : text/pdf
> Content-Length: 200000
> Content-Disposition: attachment; filename="doc0001.pdf"
>
> So far, so good, it works.
>
> Now, I would like to save space on the server, and compress the 
> original documents. So I would for example take "doc0001.pdf", and 
> compress it into "doc0001.pdf.zip". (I mean really on the disk of the 
> server, stored in compressed form, not just compressed "in transit".) 
> I would still want the user to use the same link to retrieve the 
> document, and I would of course want that this is still seen as a pdf 
> document by their browser, and not as a zip file.
> I imagine that what I need to do then in my active module, is to 
> return the zipped version of the document to the browser with the following headers :
> Content-Type : text/pdf
> Content-Disposition: attachment; filename="doc0001.pdf"
> Content-transfer-encoding: zip
> Content-Length: (size of the zipped version)
>
> and that the browser will automatically uncompress it and present it 
> to the user as an uncompressed pdf document.
>
> Is that true, and is it all there is to it, or am I missing something ?
>

I'm not sure content-transfer-encoding is the right header, I think just Content-encoding
is what you want. Otherwise, that should work I think, but it requires that people's browsers
support zip encoding, which mine, for instance (FF3 on Linux) does not.

If you're going to do this and you don't want to lock anybody out because of browser in-compatibilities,
I think you're going to have to parse the request headers, find out if they support the specified
encoding, and if not, have your server decompress on the fly before sending.

That's my $0.02.

-Brian

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