lightmy.dayINSTANT ANSWERS

Informational

HTTP 100: Continue

HTTP 100 means the server received the request headers and the client can continue.

Meaning

The server is telling the client to keep sending the request body.

Common causes

This appears when a client uses Expect: 100-continue before sending a large body.

What to check

Usually no fix is needed. If uploads stall, check proxy support for Expect handling.

Example response

HTTP/1.1 100 Continue

References

Registry: IANA HTTP Status Code Registry
Spec: RFC 9110 §15.2.1
Guide: MDN 100 Continue

Related HTTP status codes

Nearby codes often answer the next debugging question.

101 Switching ProtocolsHTTP 101 means the server is switching to a different protocol.103 Early HintsHTTP 103 means the server is sending early hints before the final response.200 OKHTTP 200 means the request succeeded.