Request lines were encoded with `json.Marshal`, which writes `&`, `<`
and `>` as `\u0026`, `\u003c` and `\u003e`. A query string or referer
then did not read as the visitor sent it, and `grep` for it found
nothing. Request lines now hold the three characters as sent, and stay
valid JSON: they are written by a `json.Encoder` with HTML escaping off.
Model: opus-5-5