417 Expectation Failed
The 417 Expectation Failed status code indicates that the expectation given in the request's Expect header could not be met by at least one of the inbound servers.
Writing responses (servers)
Servers produce this status code when the client makes a request with the Expect header with a value not understood by the server, see the header description for information.
Reading responses (clients)
Clients should reissue the request, reworked to not use the Expect header. See Expect header for additional informaton.
Overview table
- Name
- 417
- Message
- 417 Expectation Failed
- Description
- The Expect header has an unsupported value.
- Specification
- RFC 7231: HTTP/1.1 Semantics and Content ยง6.5.13. 417 Expectation Failed
Example
HTTP/1.1 417 Expectation Failed