1xx Informational
HTTP 103 Early Hints
Used to preload resources while the server prepares a response by sending Link headers early.
When is 103 used?
- Preloading CSS/JS before final response
- Hinting the browser to start fetching critical resources
How to handle a 103 response
Clients rarely see these directly; HTTP libraries handle them before the final response arrives, and servers usually send them automatically.
Check the status code a URL returns from the command line:
curl -s -o /dev/null -w "%{http_code}\n" https://example.comFrequently Asked Questions
What does HTTP 103 mean?
103 Early Hints: Used to preload resources while the server prepares a response by sending Link headers early.
Is 103 an error?
No. 103 is in the 1xx Informational class. Informational responses: the request was received and processing continues.