Merge remote-tracking branch 'origin/master'

# Conflicts:
#	main.go

main.go

@@ -64,7 +64,9 @@ func webp2jpg(path string, md5Path string, writer http.ResponseWriter) {
 
 	resp, getErr := http.Get(path)
 	if getErr != nil {
-		log.Fatal(getErr)
+		log.Print(getErr)
+		writer.WriteHeader(404)
+		return
 	}
 	endTime := time.Now().UnixNano()