HTTP 417 Expectation Failed Error - Meaning & Fix
The HTTP 417 Expectation Failed status code occurs when the server cannot meet the requirements specified in the Expect header of the request. This response is sent when the server does not support or cannot fulfill the expectations set by the client. It indicates a failure in processing the request as anticipated.
Main causes
Server does not support the expectations stated in the Expect header of the request.
Misconfiguration of the server leading to inability to meet the requirements specified in the Expect header.
Proxy or intermediary between the client and server that strips or alters headers, affecting the Expect header handling.
Client error in setting an unrealistic or unsupported expectation in the Expect header.
# Request example curl -X PUT https://sandbox.oxylabs.io/ -H 'Accept: */*;q=0.8' -H 'Accept-Encoding: compress' -H 'User-Agent: AppleWebKit/537.36'
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Common fixes
Shorten the URL by reducing the number of query parameters or the length of each parameter.
Convert the GET request to a POST request to handle larger amounts of data in the request body instead of the URL.
Check and modify server settings to increase the maximum allowable URL length.
Review and correct any redirection loops or misconfigurations causing excessive URL length.
# Response example HTTP/1.1 417 Expectation Failed Content-Type: text/html; charset=UTF-8 Content-Length: 49417 Expectation Failed
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