How to counter Corki

How do I build to stop Corki from 1 hitting me with ad and ap damage. He build full ad items, but his bombs still do well over half my health. Riot fix him. He builds Maw going mid lane, so I build Void staff, Abyssal Scepter and {{item:3151}} and still do 0 damage to him. Why isn't everybody spamming Corki mid if he is so broken.
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