curl ignoring seek failure

[jeroen]

I did this

If the server issues a redirect with body, for example HTTP 308, but the input has already been consumed and cannot be rewinded, curl should probably error.

For example:

echo '{"foo":123}' | curl -H "Content-Type: application/json" -T . -Lv  "https://httpbin.org/redirect-to?status_code=308&url=/put"

Shows me:

< HTTP/2 308
< date: Mon, 26 May 2025 14:48:27 GMT
< content-type: text/html; charset=utf-8
< content-length: 0
< server: gunicorn/19.9.0
* Need to rewind upload for next request
< location: /put
< access-control-allow-origin: *
< access-control-allow-credentials: true
<
* Ignoring the response-body
* Connection #0 to host httpbin.org left intact
* seek callback returned error 2
* rewind of client reader 'cr-in' failed: 65
* Issue another request to this URL: 'https://httpbin.org/put'
* Found bundle for host: 0x6000000e4150 [can multiplex]
* Re-using existing connection with host httpbin.org
* seek callback returned error 2
* rewind of client reader 'cr-in' failed: 65

So it fails to seek, but then the request claims to succeed, uploading nothing?

I expected the following

No response

curl/libcurl version

curl 8.14.0

operating system

All