Class: OutputCompression

Inherits:
Object
  • Object
show all
Includes:
Mongrel::HttpHandlerPlugin
Defined in:
lib/mongrel_output_compression/init.rb

Overview

HTTP Output Compression Handler Plugin

This class is a Mongrel web server plugin to handle a gzip/deflate response if the client supports it.

Instance Method Summary collapse

Instance Method Details

#process(request, response) ⇒ Object 



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# File 'lib/mongrel_output_compression/init.rb', line 20

def process(request, response)
   return if COMPRESSION_DISABLED || request.params["HTTP_ACCEPT_ENCODING"].nil?
   begin
      request.params["HTTP_ACCEPT_ENCODING"].split(/\s*,\s*/).each do |encoding|
        case encoding
           when /\Agzip\b/
              strio = StringIO.new
              def strio.close
                 rewind 
              end
              gz = Zlib::GzipWriter.new(strio)
              gz.write(response.body.string)
              gz.close
              response.body = strio
              response.body.rewind
           when /\Adeflate\b/
              response.body = StringIO.new(Zlib::Deflate.deflate(response.body.string))
              response.body.rewind
           when /\Aidentity\b/
              # do nothing for identity
           else
              next # the encoding is not supported, try the next one
        end
        @content_type = encoding
        break    # the encoding is supported, stop
      end
      response.header['Content-Encoding'] = @content_type
      # if response.header['Vary'] != '*'
      #    head['Vary'] = response.header['Vary'].to_s.split(',').push('Accept-Encoding').uniq.join(',')
      # end
      STDERR.puts "Response body was encoded with #{@content_type}\n"
   rescue Exception => e
      STDERR.puts "Error with HTTP Compression: #{e.to_s}\n"
      response.start(500, true) do |head, out|
         out.write "error proceessing #{request.params['REQUEST_PATH']}\n"
      end
   end
end