fier/s3: save "Content-Disposition" to extended properties

related to https://github.com/chrislusf/seaweedfs/issues/2371

weed/server/common.go

@@ -256,6 +256,9 @@ func adjustHeaderContentDisposition(w http.ResponseWriter, r *http.Request, file
 		w.Header().Set("Content-Disposition", responseContentDisposition)
 		return
 	}
+	if w.Header().Get("Content-Disposition") != "" {
+		return
+	}
 	if filename != "" {
 		filename = url.QueryEscape(filename)
 		contentDisposition := "inline"

weed/server/filer_server_handlers_write_autochunk.go

@@ -218,7 +218,7 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 	entry.Extended = SaveAmzMetaData(r, entry.Extended, false)
 
 	for k, v := range r.Header {
-		if len(v) > 0 && (strings.HasPrefix(k, needle.PairNamePrefix) || k == "Cache-Control" || k == "Expires") {
+		if len(v) > 0 && (strings.HasPrefix(k, needle.PairNamePrefix) || k == "Cache-Control" || k == "Expires" || k == "Content-Disposition") {
 			entry.Extended[k] = []byte(v[0])
 		}
 	}