Fix some trivial problems (#34579) (#34585)

Backport #34579 by wxiaoguang

See the comments

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/api/packages/container/container.go

@@ -721,7 +721,7 @@ func serveBlob(ctx *context.Context, pfd *packages_model.PackageFileDescriptor)
 	if u != nil {
 		headers.Status = http.StatusTemporaryRedirect
 		headers.Location = u.String()
-
+		headers.ContentLength = 0 // do not set Content-Length for redirect responses
 		setResponseHeaders(ctx.Resp, headers)
 		return
 	}