Caddyfile header directive unable to override file_server ETag

Question

Invoking caddy run against the Caddyfile:

http://localhost
header ETag forcedValue
file_server

I expect curl -v http://localhost/Caddyfile to show a response with the ETag forcedValue.

Instead, a generated tag based on the Caddyfile's mtime and size is returned.

---

Things attempted:

• order header before file_server / order header after file_server
• tested whether header -ETag can remove the etag altogether (it does).

Answer 1

Setting the defer flag allows the ETag set by file_server to be overridden.

http://localhost
header {
  ETag forcedValue
  defer
}
file_server