404. That’s an error.

The requested URL /translate_c?anno=0&depth=1&rurl=translate.google.com&sl=auto&sp=nmt4&tl=it&u=https://en.wikipedia.org/wiki/HKDF&xid=17259,15700002,15700022,15700186,15700191,15700248,15700253&usg=ALkJrhidd7GzRh8-1IOBWWfxLR54u0NpTQ was not found on this server. That’s all we know.