A: This might be a malformed user-agent or a bot misinterpreting a directory listing. Or a developer left a debug endpoint.
A: Use a terminal app (Termux on Android) with echo -n "0123456789" > code.txt , then upload to a server. Download- code.txt -10 bytes-
echo -n "1234567890" > code.txt # 10 bytes (no newline) Then verify size: A: This might be a malformed user-agent or