In certain situations, the server responds with a 304 Not Modified status code for a request that lacks any specific conditions.
Reproduction steps:
{
log
cache {
stale 3600s
}
}
http://localhost:80 {
log
cache
reverse_proxy http://localhost:82
}
http://localhost:82 {
log
header Cache-Control "max-age=1"
file_server {
root /data/caddy/
index instance.uuid
}
}$ curl -i-H 'Cache-Control: max-stale=6' localhost:80
HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: max-age=1
Cache-Status: Souin; fwd=uri-miss; stored; key=GET-http-localhost-/
Content-Length: 36
Date: Fri, 26 Dec 2025 12:28:54 GMT
Etag: "df7g3dt1b7k010"
Last-Modified: Thu, 25 Dec 2025 16:40:49 GMT
...
$ curl -i-H 'Cache-Control: max-stale=6' localhost:80
HTTP/1.1 304 Not Modified
Cache-Control: max-age=1
Cache-Status: Souin; fwd=request; fwd-status=304; key=GET-http-localhost-/; detail=REQUEST-REVALIDATION
Date: Fri, 26 Dec 2025 12:29:26 GMT
Etag: "df7g3dt1b7k010"
...
In certain situations, the server responds with a
304 Not Modifiedstatus code for a request that lacks any specific conditions.Reproduction steps:
{ log cache { stale 3600s } } http://localhost:80 { log cache reverse_proxy http://localhost:82 } http://localhost:82 { log header Cache-Control "max-age=1" file_server { root /data/caddy/ index instance.uuid } }