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Tomasz Nurkiewicz 🇺🇦 Profile picture
Tomasz Nurkiewicz 🇺🇦
@tnurkiewicz
@Java_Champions | 👨‍💻 CTO at @devskiller | ✉️ nurkiewicz (at gmail) | 🔊 https://t.co/NUwJFxHIYH | 👨‍🏫 https://t.co/mJPHIWTxAS | DMs open
Apr 28, 2022 • 4 tweets • 2 min read
In #Java, two entirely different URLs may be considered equal. Sometimes. Why? DNS. It's always DNS. Well, Java works this way: "Two hosts are considered equivalent if both host names can be resolved into the same IP addresses". Let's dig (no pun intended!) a little bit deeper 🧵 Using dig we notice that these domains (Polish president and some dating site) point to the same servers. Scandal? No. CDN. These are #Cloudflare IPs: