100 Continue
1xx Informational
The first part of the request arrived; go ahead and send the rest.
| On the wire | HTTP/1.1 100 Continue |
|---|---|
| Code | 100 |
| 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 100 Continue mean?
The first part of the request arrived; go ahead and send the rest.
Q. What does 100 Continue look like on the wire?
It travels as HTTP/1.1 100 Continue
Q. Is 100 Continue an error?
No — it is part of a normal exchange, not a failure.
Q. What group does 100 Continue belong to?
The 1xx informational group; the rest of that group is listed further down.