103 Early Hints
1xx Informational
Sends hints ahead of the body so the browser can start fetching resources early.
| On the wire | HTTP/1.1 103 Early Hints |
|---|---|
| Code | 103 |
| Is it an error | No — not an error |
| Category | 1xx Informational |
A progress note; the real answer follows.
How to read this
- The first digit of a status code carries the meaning: 4 means the request, 5 means the server.
- 404 means "not there"; 403 means "there, but not for you". Swapping them makes debugging slower.
- Header names are case-insensitive — Content-Type and content-type are the same header.
- Caching and CORS problems usually come down to one header line, visible in the browser’s network tab.
Frequently asked questions
Q. What does HTTP 103 Early Hints mean?
Sends hints ahead of the body so the browser can start fetching resources early.
Q. What does 103 Early Hints look like on the wire?
It travels as HTTP/1.1 103 Early Hints
Q. Is 103 Early Hints an error?
No — it is part of a normal exchange, not a failure.
Q. What group does 103 Early Hints belong to?
The 1xx informational group; the rest of that group is listed further down.