1xx Informational

100 Continue

The server received the request headers and the client should send the body.

Sent in reply to a request with Expect: 100-continue, so a client can check whether the server will accept a large upload before sending it.

Notes

• curl sends Expect: 100-continue automatically for large POST bodies; disable it with -H "Expect:" if a proxy mishandles it.
• Most browsers and HTTP libraries handle 100 transparently — you rarely see it in application code.

Example response

HTTP/1.1 100 Continue
Date: Thu, 22 Oct 2026 08:00:00 GMT

Check a URL’s status with curl -I https://example.com, which prints the status line and headers.

Related status codes

• 101 Switching Protocols

Related tools

curl to Code · LLM API Playground · LLM Stream Parser