细思则恐，验证码的反向案例，同样是文字，机器容易识别，人类难以识别

[xiangyuecn]

/t/463240 今天看到的 #11 U+202E 从右至左强制

/t/463025 昨天看到的 #20 U+0049 U+006C 某些折磨人的字体，傻傻视觉难分清

细思极恐啊，原来这里面水这么深，感觉后端所有防御瞬间都有了超级大漏洞

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毁三观链接：

http://www.sohu.com/a/220344045_261288

[xiangyuecn]

试一下显示视频 <iframe height=498 width=510 src='http://player.youku.com/embed/XNDAwMjkxMDM0MA==' frameborder=0 'allowfullscreen'></iframe>

[xiangyuecn]

试一下显示视频 embed html 标签 <embed src='http://player.youku.com/player.php/sid/XNDAwMjkxMDM0MA==/v.swf' allowFullScreen='true' quality='high' width='480' height='400' align='middle' allowScriptAccess='always' type='application/x-shockwave-flash'></embed>

[xiangyuecn]

试一下 flash url，http://player.youku.com/player.php/sid/XNDAwMjkxMDM0MA==/v.swf

[xiangyuecn]

https://player.youku.com/player.php/sid/XNDAwMjkxMDM0MA==/v.swf

[xiangyuecn]

试一下显示视频 embed html 标签 <embed src='https://player.youku.com/player.php/sid/XNDAwMjkxMDM0MA==/v.swf' allowFullScreen='true' quality='high' width='480' height='400' align='middle' allowScriptAccess='always' type='application/x-shockwave-flash'></embed>

[xiangyuecn]

iframe+https src
<iframe src="https://player.youku.com/embed/XNDAwMjkxMDM0MA=="></iframe>

[xiangyuecn]

https://player.youku.com/embed/XMjUwMTgzMjM2OA==?_time=0