http status code
417 Expectation Failed
The HTTP 417 Expectation Failed client error response status code indicates that the expectation given in the request’s Expect header could not be met.
After receiving a 417 response, a client should repeat the request without an Expect request header, including the file in the request body without waiting for a 100 response.
See the Expect header documentation for more details.
Status
417 Expectation Failed
Examples
Expectations unsupported
The following PUT request sends information about an intended file upload to a server.
The client uses an Expect: 100-continue header and no request body to avoid sending data over the network that may result in an error such as 405, 401, or 403 response:
PUT /videos HTTP/1.1
Host: uploads.example.com
Content-Type: video/h264
Content-Length: 1234567890987
Expect: 100-continue
In this example server implementation, expectations are not supported and the presence of an Expect header with any value results in 417 responses:
HTTP/1.1 417 Expectation Failed
Date: Fri, 28 Jun 2024 11:40:58 GMT
The client responds by making a request without expectations and with the content in the request body:
PUT /videos HTTP/1.1
Host: uploads.example.com
Content-Type: video/h264
Content-Length: 1234567890987
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