1. HTTP (Hypertext Transfer Protocol)

  1. HTTP Status Codes

  1. 417 Expectation Failed
    1. Writing responses (servers)
    2. Reading responses (clients)
    3. Overview table
    4. Example

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