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    <p>I'm not a ruby expert by any stretch. I also haven't tried to repro this problem in order to verify my results. But after digging through the rack and actionpack code, I might have something.</p> <p>The doc for "rack.input" states: "The input stream is an IO-like object which contains the raw HTTP POST data."</p> <p>So you're using that correctly, it would seem.</p> <p>However, actionpack tries to parse JSON out of the body (if the content type is specified as JSON) and retrieves the body like this:</p> <pre><code>when :json body = request.raw_post </code></pre> <p>where "request" is actionpack's own Request class, and "raw_post" is defined like this:</p> <pre><code>def raw_post unless @env.include? 'RAW_POST_DATA' @env['RAW_POST_DATA'] = body.read(@env['CONTENT_LENGTH'].to_i) body.rewind if body.respond_to?(:rewind) end @env['RAW_POST_DATA'] end </code></pre> <p>and "Request.body" is:</p> <pre><code>def body if raw_post = @env['RAW_POST_DATA'] raw_post.force_encoding(Encoding::BINARY) if raw_post.respond_to?(:force_encoding) StringIO.new(raw_post) else @env['rack.input'] end end </code></pre> <p>That all looks fine and good (though it's confusing to figure out who caches the value first :) ). It looks like the problem is in how the post data is read:</p> <pre><code>@env['RAW_POST_DATA'] = body.read(@env['CONTENT_LENGTH'].to_i) </code></pre> <p>So I'm guessing the problem is that since you change "rack.input" but don't update "CONTENT_LENGTH", actionpack is truncating the data since obviously the zipped content would've been shorter than the unzipped content.</p> <p>Try updating "CONTENT_LENGTH" in your middleware code and see if that fixes it.</p>
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    1. CODude you rock. That was it! Here is the updated working code: http://gist.github.com/635471
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    2. COCool story bro :D
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    3. COExcelent explanation, that how every one should be :)
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