3 ms·

I'm not sure you could prevent the client from providing the body before you're able to stop it and tell it to redirect instead - so there's a high risk you end

I'm not sure you could prevent the client from providing the body before you're able to stop it and tell it to redirect instead - so there's a high risk you end up with everything being uploaded twice.

willglynn 8y ago
`Expect: 100-continue` lets the server control this. If it responds "100 Continue", you upload the body. If it responds with a redirect, you redirect without uploading the body. This is standard HTTP/1.1, and it's used by the S3 API for PUT requests.