net/http: avoid sending unspecified time for directories

Change applies to sendFile.
This is already done for sendContent.

Change-Id: If43d9ab99e6e66a1363b08e0bdcceb57df1f855c
GitHub-Last-Rev: 1c47620a09a6f5e2b3d777fadaad6e0189de4af5
GitHub-Pull-Request: golang/go#34631
Reviewed-on: https://go-review.googlesource.com/c/go/+/198139
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

diff --git a/src/net/http/fs.go b/src/net/http/fs.go
index 27512411de6b716087b5db5981f0ce8b78acfb06..80c391d1c308a7d61cea1a5263f48c93d8540f1a 100644 (file)
--- a/src/net/http/fs.go
+++ b/src/net/http/fs.go
@@ -610,7 +610,7 @@ func serveFile(w ResponseWriter, r *Request, fs FileSystem, name string, redirec
                        writeNotModified(w)
                        return
                }
-               w.Header().Set("Last-Modified", d.ModTime().UTC().Format(TimeFormat))
+               setLastModified(w, d.ModTime())
                dirList(w, r, f)
                return
        }