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Client Error (4xx)

HTTP/1.1

417 Expectation Failed

The server cannot meet the requirements of the Expect request header.

CategoryClient Error (4xx)
API error types0 error schemas
Related headers1 header
Updated2026-07-09

What does HTTP status code 417 mean?

The 417 Expectation Failed status code indicates that the server is unable to satisfy the expectations set in the client’s Expect request header.

When to use it in APIs

Occasionally returned if a client sends Expect: 100-continue but the server cannot comply.

How it compares to other codes

  • 100 Continue: The positive response indicating that the expectation can be met.
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