1 files changed, 4 insertions, 0 deletions
diff --git a/main.go b/main.go
index 7476143..2ed8b93 100644
--- a/main.go
+++ b/main.go
@@ -206,6 +206,10 @@ func (s *Server) indexPost(w http.ResponseWriter, r *http.Request) {
 	if mimeType == "" {
 		mimeType, ext, rd, _ = detectMimetype(r.Body)
 	} else {
+		mime := mimetype.Lookup(mimeType)
+		if mime != nil {
+			ext = mime.Extension()
+		}
 		rd = r.Body
 	}
 	f, name, err := s.createRandomFilename(ext)