lib/api_auth/base.rb in api-auth-2.3.0 vs lib/api_auth/base.rb in api-auth-2.3.1

@@ -69,10 +69,10 @@
       b64_encode(Digest::SHA2.new(512).digest(random_bytes))
     end
 
     private
 
-    AUTH_HEADER_PATTERN = /APIAuth(?:-HMAC-(MD5|SHA(?:1|224|256|384|512)?))? ([^:]+):(.+)$/
+    AUTH_HEADER_PATTERN = /APIAuth(?:-HMAC-(MD5|SHA(?:1|224|256|384|512)?))? ([^:]+):(.+)$/.freeze
 
     def request_within_time_window?(headers, clock_skew)
       Time.httpdate(headers.timestamp).utc > (Time.now.utc - clock_skew) &&
         Time.httpdate(headers.timestamp).utc < (Time.now.utc + clock_skew)
     rescue ArgumentError