HTTP 103 Early Hints

HTTP 103 Early Hints indicates a informational response outcome.

What it means

Early Hints describes how the server processed the request and what the client should do next.

Why it happens

Common triggers include protocol conditions, routing decisions, and application behavior.

Common causes

Normal protocol behavior

How to fix it

No fix needed

Example request/response

GET /example HTTP/1.1
Host: errorlookup.com

HTTP/1.1 103 Early Hints

Browser/dev/server context

Use browser network tools, server logs, and APM traces together when diagnosing HTTP 103.

Related status codes

FAQ

Is HTTP 103 officially assigned?

Yes. This code is assigned in the IANA registry.