diff --git a/api/handler/get.go b/api/handler/get.go
index 6c1db9e..6ac1df6 100644
--- a/api/handler/get.go
+++ b/api/handler/get.go
@@ -73,7 +73,7 @@ func writeHeaders(h http.Header, info *layer.ObjectInfo) {
 	h.Set(api.ETag, info.HashSum)
 
 	for key, val := range info.Headers {
-		h.Set(api.MetadataPrefix+key, val)
+		h[api.MetadataPrefix+key] = []string{val}
 	}
 }
 
diff --git a/api/handler/put.go b/api/handler/put.go
index 311a206..77da94f 100644
--- a/api/handler/put.go
+++ b/api/handler/put.go
@@ -59,7 +59,7 @@ func parseMetadata(r *http.Request) map[string]string {
 	res := make(map[string]string)
 	for k, v := range r.Header {
 		if strings.HasPrefix(k, api.MetadataPrefix) {
-			key := strings.TrimPrefix(k, api.MetadataPrefix)
+			key := strings.ToLower(strings.TrimPrefix(k, api.MetadataPrefix))
 			res[key] = v[0]
 		}
 	}