read_body

# File lib/webrick/httprequest.rb, line 272
    def read_body(socket, block)
      return unless socket
      if tc = self['transfer-encoding']
        case tc
        when /chunked/io then read_chunked(socket, block)
        else raise HTTPStatus::NotImplemented, "Transfer-Encoding: #{tc}."
        end
      elsif self['content-length'] || @remaining_size
        @remaining_size ||= self['content-length'].to_i
        while @remaining_size > 0 
          sz = BUFSIZE < @remaining_size ? BUFSIZE : @remaining_size
          break unless buf = read_data(socket, sz)
          @remaining_size -= buf.size
          block.call(buf)
        end
        if @remaining_size > 0 && @socket.eof?
          raise HTTPStatus::BadRequest, "invalid body size."
        end
      elsif BODY_CONTAINABLE_METHODS.member?(@request_method)
        raise HTTPStatus::LengthRequired
      end
      return @body
    end