Ns_ConnReturnData(3aolserver) on Linux
The text 1d64abab6e16, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it. The page shows this text now.
Routines to generate simple single-buffer responses