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-rw-r--r--examples/echo.ru1
1 files changed, 1 insertions, 0 deletions
diff --git a/examples/echo.ru b/examples/echo.ru
index e982180..453a5e6 100644
--- a/examples/echo.ru
+++ b/examples/echo.ru
@@ -1,4 +1,5 @@
 #\-E none
+# frozen_string_literal: false
 #
 # Example application that echoes read data back to the HTTP client.
 # This emulates the old echo protocol people used to run.