From: "Luis G." <l17339@...>
Date: 2011-02-28T20:08:30+09:00
Subject: mechanize and Content Encoding Error

Hello guys.

I'm trying to get some files from a webpage using Mechanize. Something
like this:

begin
      Timeout::timeout(25){
        res = agent.get(torrent_download).save_as(filename)
      }
    rescue SocketError => e
      log.error 'Fail saving the file '+filename+': SocketError'
      end
    rescue SystemCallError => e
      log.error 'Fail saving the file '+filename+': SystemCallError'
      end
    rescue Timeout::Error => e
      log.error 'Fail saving the file '+filename+' Timeout::Error'
      end
    rescue Net::HTTPBadResponse => e
      log.error  'Fail saving the file '+filename+' HTTPBadResponse'
      end
    rescue Mechanize::ResponseCodeError => e
      log.error  'Fail saving the file '+filename+'
Mechanize::RespError'
      end
end

Everything was working perfectly till I found a page that, if we access
using browser, we get the following error:

Content Encoding Error

(http://support.mozilla.com/en-US/kb/error%20loading%20web%20sites#w_content-encoding-error)

When I get a page like that I get the following exception:

/var/lib/gems/1.8/gems/mechanize-1.0.0/lib/mechanize/chain/body_decoding_handler.rb:24:in
`inflate': invalid stored block lengths (Zlib::DataError)
        from
/var/lib/gems/1.8/gems/mechanize-1.0.0/lib/mechanize/chain/body_decoding_handler.rb:24:in
`handle'
        from
/var/lib/gems/1.8/gems/mechanize-1.0.0/lib/mechanize/chain.rb:29:in
`pass'
        from
/var/lib/gems/1.8/gems/mechanize-1.0.0/lib/mechanize/chain/handler.rb:6:in
`handle'
        from
/var/lib/gems/1.8/gems/mechanize-1.0.0/lib/mechanize/chain/response_reader.rb:35:in
`handle'
        from
/var/lib/gems/1.8/gems/mechanize-1.0.0/lib/mechanize/chain.rb:24:in
`handle'
        from
/var/lib/gems/1.8/gems/mechanize-1.0.0/lib/mechanize.rb:543:in
`fetch_page'
        from /usr/lib/ruby/1.8/net/http.rb:1053:in `request'
        from /usr/lib/ruby/1.8/net/http.rb:2140:in `reading_body'
        from /usr/lib/ruby/1.8/net/http.rb:1052:in `request'
        from
/var/lib/gems/1.8/gems/mechanize-1.0.0/lib/mechanize.rb:538:in
`fetch_page'
        from
/var/lib/gems/1.8/gems/mechanize-1.0.0/lib/mechanize.rb:611:in
`fetch_page'
        from
/var/lib/gems/1.8/gems/mechanize-1.0.0/lib/mechanize.rb:259:in `get'
...


How can I handle this exception?
SystemCallError shouldn't handle all kind of exceptions, including this
one?
Any ideas?

Thanks,

Luis

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