[web] Upside-down cake パズル [web] #DANCE [web] Brainfxxk Challenge "r"とDOM Clobbering [crypto] Unique Flag [web] Upside-down cake main.mjsを読むと app.post('/', async (c) => { const {palindrome} = await c.req.json(); const error = validatePalindrome(palindrome); if (error) { c.status(400); return c.text(…