fileserver: set Content-Length for precompressed files (#7251)

* set Content-Length for precompressed files * Update modules/caddyhttp/fileserver/staticfiles.go Co-authored-by: Matt Holt <mholt@users.noreply.github.com> --------- Co-authored-by: Matt Holt <mholt@users.noreply.github.com>

WeidiDeng committed Sep 11, 2025 at 12:48 UTC b462615439bf354dd1cb6780fb564b6a6c4a352c

1 file changed +5 -5

modules/caddyhttp/fileserver/staticfiles.go

+5 -5

@@ -458,12 +458,12 @@ func (fsrv *FileServer) ServeHTTP(w http.ResponseWriter, r *http.Request, next c

458 defer file.Close()

459 respHeader.Set("Content-Encoding", ae)

460

461 - // stdlib won't set Content-Length if Content-Encoding is set.

462 - // set Range header if it's not present will force Content-Length to be set

461 + // stdlib won't set Content-Length for non-range requests if Content-Encoding is set.

462 + // see: https://github.com/caddyserver/caddy/issues/7040

463 + // Setting the Range header manually will result in 206 Partial Content.

464 + // see: https://github.com/caddyserver/caddy/issues/7250

465 if r.Header.Get("Range") == "" {

464 - r.Header.Set("Range", "bytes=0-")

465 - // remove this header, because it is not part of the request

466 - defer r.Header.Del("Range")

466 + respHeader.Set("Content-Length", strconv.FormatInt(compressedInfo.Size(), 10))

467 }

468

469 // try to get the etag from pre computed files if an etag suffix list was provided