bash: quote the array expansion

src/scripts/backupapp.sh

@@ -42,7 +42,7 @@ for try in `seq 1 5`; do
 
     if tar -cvzf - -C "${app_data_snapshot}" . \
            | openssl aes-256-cbc -e -pass "pass:${backup_key}" \
-           | curl --fail -X PUT ${headers[@]} --data-binary @- "${backup_url}" 2>"${error_log}"; then
+           | curl --fail -X PUT "${headers[@]}" --data-binary @- "${backup_url}" 2>"${error_log}"; then
         break
     fi
     cat "${error_log}" && rm "${error_log}"