103
Informational
103 Early Hints
Used to return some response headers before the final HTTP message.
Definition (RFC 8297)
HTTP status code 103 103 Early Hints is defined in RFC 8297 (An HTTP Status Code for Indicating Hints), not in RFC 9110. RFC 9110 defines the core HTTP status codes; this one was registered separately in the IANA HTTP Status Code Registry.
Description
The 103 Early Hints status code allows the server to send preliminary HTTP headers before the final response. This is primarily used with the Link header to allow preloading of resources while the server is still preparing the full response.
This can significantly improve page load times by allowing the browser to start fetching critical resources earlier.
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