---
set: 4
code: 417
title: Expectation Failed
references:
    "Rails HTTP Status Symbol": ":expectation_failed"
---

The 417 (Expectation Failed) status code indicates that the expectation given in
the request's Expect header field ([RFC7231 Section 5.1.1][2]) could not be met
by at least one of the inbound servers.

Source: [RFC7231 Section 6.5.14][1]

[1]: <http://tools.ietf.org/html/rfc7231#section-6.5.14>
[2]: <http://tools.ietf.org/html/rfc7231#section-5.1.1>