HTTP 103 (HTTP_EARLY_HINTS): meaning and handling

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: HTTP 103 lets a server send selected response headers before its final response.

Could be also:
Constant	Type	OS
ERROR_TOO_MANY_SEM_REQUESTS	Win32 error	Windows
ECONNABORTED	errno	Linux
ENOPOLICY	errno	Mac
EALREADY	errno	Windows
CONFIG_INITIALIZATION_FAILED	BugCheck Code	Windows

HTTP_EARLY_HINTS

HTTP 103 is an informational response. It is normally used with Link headers so a user agent can begin preloading resources while the origin server is still preparing the final response.

A client must treat the eventual final response as authoritative. Do not use 103 as an application result or as proof that the requested resource was successfully generated; it only carries early, non-final metadata.

RFC 9110: HTTP Semantics

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