What Is HTTP 100 Continue?
HTTP 100 Continue explained, and what it means when you see it in CI/CD and deployments.
HTTP 100 is an informational response telling the client to continue sending the request body.
What it means
A 100 appears when a client sends Expect: 100-continue before a large body, letting the server reject early (e.g. on auth) before the upload.
When you see it in CI/CD
CI rarely handles 100 directly; clients manage it. It can matter when debugging large artifact uploads with verbose curl output.
Key takeaways
- 100 means continue sending the body.
- Used with Expect: 100-continue.
- Clients handle it automatically.