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fileserver: Only set Etag if not already set (fix #5546) (#5547)

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Charles Duffy 2023-05-20 18:21:43 -05:00 committed by GitHub
parent 5336bc0fb6
commit 2615c9c524
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1 changed files with 12 additions and 4 deletions
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16
modules/caddyhttp/fileserver/staticfiles.go
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@ -356,7 +356,9 @@ func (fsrv *FileServer) ServeHTTP(w http.ResponseWriter, r *http.Request, next c
}
var file fs.File
var etag string
// etag is usually unset, but if the user knows what they're doing, let them override it
etag := w.Header().Get("Etag")
// check for precompressed files
for _, ae := range encode.AcceptedEncodings(r, fsrv.PrecompressedOrder) {
@ -388,7 +390,9 @@ func (fsrv *FileServer) ServeHTTP(w http.ResponseWriter, r *http.Request, next c
// don't assign info = compressedInfo because sidecars are kind
// of transparent; however we do need to set the Etag:
// https://caddy.community/t/gzipped-sidecar-file-wrong-same-etag/16793
etag = calculateEtag(compressedInfo)
if etag == "" {
etag = calculateEtag(compressedInfo)
}
break
}
@ -408,7 +412,9 @@ func (fsrv *FileServer) ServeHTTP(w http.ResponseWriter, r *http.Request, next c
}
defer file.Close()
etag = calculateEtag(info)
if etag == "" {
etag = calculateEtag(info)
}
}
// at this point, we're serving a file; Go std lib supports only
@ -421,7 +427,9 @@ func (fsrv *FileServer) ServeHTTP(w http.ResponseWriter, r *http.Request, next c
// set the Etag - note that a conditional If-None-Match request is handled
// by http.ServeContent below, which checks against this Etag value
w.Header().Set("Etag", etag)
if etag != "" {
w.Header().Set("Etag", etag)
}
if w.Header().Get("Content-Type") == "" {
mtyp := mime.TypeByExtension(filepath.Ext(filename))