Yes. 4xx codes are client errors: The request contains a mistake or can't be fulfilled as sent.

4xx · Client error

HTTP 417 Expectation Failed

The server can't meet the Expect header requirement.

Example response

HTTP

HTTP/1.1 417 Expectation Failed
Content-Type: application/json; charset=utf-8

{ "error": "Expectation Failed" }

Look up the headers shown here in the HTTP headers reference.

What does HTTP 417 mean?: Expectation Failed. The server can't meet the Expect header requirement.
Is 417 an error?: Yes. 4xx codes are client errors: The request contains a mistake or can't be fulfilled as sent.