fileserver: set Range header for precompressed static files to force Content Length header to appear (#7042)

Co-authored-by: Matt Holt <mholt@users.noreply.github.com>

WeidiDeng committed Aug 22, 2025 at 22:23 UTC 67debd0e11c3c880bb6fc7a92325989576b0a7fa

1 file changed +8 -1

modules/caddyhttp/fileserver/staticfiles.go

+8 -1

@@ -457,7 +457,14 @@ func (fsrv *FileServer) ServeHTTP(w http.ResponseWriter, r *http.Request, next c

457 }

458 defer file.Close()

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

460 - respHeader.Del("Accept-Ranges")

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

463 + 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")

467 + }

468

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

470 if etag == "" && fsrv.EtagFileExtensions != nil {