From 3ad2a93ce1614e61eb12aed24eb9a770691c3a5b Mon Sep 17 00:00:00 2001
From: Chedli Bourguiba <chedli.bourguiba@edu.esiee.fr>
Date: Tue, 11 Jun 2024 03:16:59 +0200
Subject: [PATCH] Fix frozen string literal issue (#709)

---
 lib/fog/aws/signaturev4.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/fog/aws/signaturev4.rb b/lib/fog/aws/signaturev4.rb
index 313233a10a..dd8b62eb9e 100644
--- a/lib/fog/aws/signaturev4.rb
+++ b/lib/fog/aws/signaturev4.rb
@@ -106,7 +106,7 @@ def canonical_query_string(query)
       end
 
       def canonical_headers(headers)
-        canonical_headers = ''
+        canonical_headers = +''
 
         for key in headers.keys.sort_by {|k| k.to_s.downcase}
           canonical_headers << "#{key.to_s.downcase}:#{headers[key].to_s.strip}\n"