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1xx Informational

103 Early Hints

The server sends Link headers early so the browser can start preloading.

What 103 means

Lets a server tell the browser which CSS, fonts or scripts to preload while it's still preparing the page. The real response follows.

Common causes

  • The server or CDN (e.g. Cloudflare) supports Early Hints.

How to fix it

If you're calling an API

  • Nothing: browsers use it automatically; API clients ignore it.

If you run the server

  • Send Link: rel=preload headers for critical assets to speed up page loads.

Should you retry?

Not applicable: it's an interim response.

Example response

HTTP
HTTP/1.1 103 Early Hints

Related headers: Link.

Defined in: RFC 8297. 103 is a informational.

HTTP 103 FAQ

What does HTTP 103 mean?

103 Early Hints: The server sends Link headers early so the browser can start preloading. Lets a server tell the browser which CSS, fonts or scripts to preload while it's still preparing the page. The real response follows.

Is 103 a client or server error?

Neither: 103 is a informational response (1xx). Interim responses: the request was received and processing continues.

How do I fix a 103 error?

Nothing: browsers use it automatically; API clients ignore it.

Should I retry after a 103?

Not applicable: it's an interim response.

Other 1xx status codes

All HTTP status codes