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exec 3<>/dev/tcp/example.com/80Opens a raw TCP socket to example.com on port 80 and binds it to file descriptor 3 for reading and writing — no curl or nc needed.
printf "GET / HTTP/1.0\r\n\r\n" >&3Writes a minimal HTTP request into that socket. >&3 sends the bytes to descriptor 3, i.e. across the network.
cat <&3Reads the server's raw HTTP response back from descriptor 3 and prints it.
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