Early Hints
What 103 means
Lets the server send preliminary headers (e.g. preload links) before the final response.
Used to hint resources the browser can start preloading while the server prepares the full response, improving page load performance.
Informational (1xx)
Provisional responses that tell the client the request was received and processing continues.
Other 1xx codes
FAQ — 103
What does HTTP 103 mean?
103 Early Hints: Lets the server send preliminary headers (e.g. preload links) before the final response. Used to hint resources the browser can start preloading while the server prepares the full response, improving page load performance.
Which class does status code 103 belong to?
103 is a Informational (1xx) code. Provisional responses that tell the client the request was received and processing continues.
Where is the 103 code defined?
Status code 103 is defined in RFC 8297 and is part of the IANA HTTP Status Code Registry.