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POServing dynamic zip files through Apache
 

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    <p>One of the responsibilities of my Rails application is to create and serve signed xmls. Any signed xml, once created, never changes. So I store every xml in the <code>public</code> folder and redirect the client appropriately to avoid unnecessary processing from the controller.</p> <p>Now I want a new feature: every xml is associated with a date, and I'd like to implement the ability to serve a compressed file containing every xml whose date lies in a period specified by the client. Nevertheless, the period cannot be limited to less than one month for the feature to be useful, and this implies some zip files being served will be as big as 50M.</p> <p>My application is deployed as a Passenger module of Apache. Thus, it's totally unacceptable to serve the file with <a href="http://api.rubyonrails.org/classes/ActionController/Streaming.html#method-i-send_data" rel="nofollow"><code>send_data</code></a>, since the client will have to wait for the entire compressed file to be generated before the actual download begins. Although I have an idea on how to implement the feature in Rails so the compressed file is produced <em>while being served</em>, I feel my server will get scarce on resources once some lengthy Ruby/Passenger processes are allocated to serve big zip files.</p> <p>I've read about <a href="http://www.therailsway.com/2009/2/22/file-downloads-done-right" rel="nofollow">a better solution</a> to serve static files through Apache, but not dynamic ones.</p> <p>So, what's the solution to the problem? Do I need something like a custom Apache handler? How do I inform Apache, from my application, how to handle the request, compressing the files and streaming the result simultaneously?</p>
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    1. USRômulo C
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      1. USAndy Lindeman
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    1. COThe ZIP file format index is at the end of the file. Also I glanced quickly through RFC 2616 (HTTP 1.1) and variable length response like that probably works although usually content length should be announced. Technically this should be possible as far as I can see.
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      1. USerloewe
    2. COThere's no HTTP problem with not knowing the length in advance, this is what chunked transfer encoding is for. You can write bytes that look like a zip file in any language, just be sure to flush your output periodically.
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