417 / Expectation Failed

“The server cannot meet the requirements of the Expect request-header field.“ — wikipedia

“The expectation given in an Expect request-header field could not be met by this server, or, if the server is a proxy, the server has unambiguous evidence that the request could not be met by the next-hop server.“ — ietf

417 / code reference(s)
Rails HTTP Status Symbol
:expectation_failed
← return