problem in cofiguring in mongrel's http_request.rb

Hi all ,               Am looking to configure mongrels's http_request.rb in order to delete mongrel temporary file after upload .This is what i would like to have

def initialize(params, socket, dispatchers)       @params = params       @socket = socket       @dispatchers = dispatchers       content_length = @params[Const::CONTENT_LENGTH].to_i       remain = content_length - @params.http_body.length

      # tell all dispatchers the request has begun       @dispatchers.each do |dispatcher|         dispatcher.request_begins(@params)       end unless @dispatchers.nil? || @dispatchers.empty?

      # Some clients (like FF1.0) report 0 for body and then send a body. This will probably truncate them but at least the request goes through usually.       if remain <= 0         # we've got everything, pack it up         @body = StringIO.new         @body.write @params.http_body         update_request_progress(0, content_length)       elsif remain > 0         # must read more data to complete body         if remain > Const::MAX_BODY           # huge body, put it in a tempfile           @body = Tempfile.new(Const::MONGREL_TMP_BASE)           @body.binmode         else           # small body, just use that           @body = StringIO.new         end

        @body.write @params.http_body         read_body(remain, content_length)       end

      @body.rewind if @body     end

Here i would like to close this @body after use by using something like @body.close but while doing so am getting error what should i do and whre should i call this @body.close