List of HTTP status codes - Wikipedia
https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
200 OK. Standard response for successful HTTP requests. The actual response will depend on the 404 error on Wikipedia. This class of status code is intended for situations in which the error seems to...
404 OK Response is returning null instead of an error · Issue #221...
https://github.com/apollographql/apollo-link-rest/issues/221
For many companies, a 404 is a "non-fatal error" -- it just means something is absent. There's often no "extra" data in the 404 response, so returning null seemed like the model that best fit GraphQL.
Http Ответы Сервера: Строка Состояния Http Ответа, Коды...
https://zametkinapolyah.ru/servera-i-protokoly/tema-5-http-otvety-servera-stroka-sostoyaniya-http-otveta-kody-sostoyaniya-zagolovki-http-otveta-primery.html
| "404" ; Не найден, Not Found. | "405" ; Метод не дозволен, Method Not. ; Allowed. <title>404 Not Found</title>.