100Continue
The server has read your request headers, they look fine, and it wants the rest of the request body.
Browse all HTTP status codesWhen you see it
You rarely see 100 in a browser. It appears when a client sends an Expect: 100-continue header before uploading a large body, asking the server whether it is worth sending at all. The server replies 100 to say go ahead, or an error code to save the client the upload.
Command-line tools that upload files are where this usually surfaces, because some of them add the Expect header automatically for bodies over a certain size and then pause waiting for the reply.
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Status codes
69 of 69 codes. Click a row to copy it.
1xx Informational (4)
2xx Success (10)
3xx Redirection (8)
4xx Client errors (31)
5xx Server errors (16)