Ruby self.send方法

在看Nginx chunked size exploit代码时，self.send()方法怎么也看不懂，一直以为是metasploit代码，后面才发现是Ruby自身语法，调用对应方法，和self.respond_to?是一体的，后者测试是否有对应方法。Ruby写的还是太少。

def dereference_got

    unless self.respond_to?(target[:store_callback]) and self.respond_to?(target[:dereference_got_callback])

      fail_with(Failure::NoTarget, "Invalid target specified: no callback functions defined")

    end

    buf = ""

    command = payload.encoded

    i = 0

    while i < command.length

      buf << self.send(target[:store_callback], target['Writable'] + i, command[i, 4].ljust(4, ";"))

      i = i + 4

    end

    buf << self.send(target[:dereference_got_callback])

    return buf

  end

https://ruby-doc.org/core-2.6.3/Object.html#method-i-respond_to-3F