Fix error

Author: esrakartalOpt

lib/optimizely/cmab/cmab_client.rb

@@ -148,18 +148,22 @@ def _do_fetch_with_retry(url, request_body, retry_config, timeout)
       #   The variation ID from the response.
 
       backoff = retry_config.retry_delay
+      last_error = nil
 
       (0..retry_config.max_retries).each do |attempt|
-        return _do_fetch(url, request_body, timeout)
-      rescue
-        if attempt < retry_config.max_retries
-          @logger.info("Retrying CMAB request (attempt: #{attempt + 1} after #{backoff} seconds)...")
-          sleep(backoff)
-          backoff = [backoff * (retry_config.backoff_multiplier**(attempt + 1)), retry_config.max_backoff].min
+        begin
+          return _do_fetch(url, request_body, timeout)
+        rescue => e
+          last_error = e
+          if attempt < retry_config.max_retries
+            @logger.info("Retrying CMAB request (attempt: #{attempt + 1} after #{backoff} seconds)...")
+            sleep(backoff)
+            backoff = [backoff * (retry_config.backoff_multiplier**(attempt + 1)), retry_config.max_backoff].min
+          end
         end
       end
 
-      error_message = Optimizely::Helpers::Constants::CMAB_FETCH_FAILED % 'Max retries exceeded for CMAB request.'
+      error_message = Optimizely::Helpers::Constants::CMAB_FETCH_FAILED % (last_error&.message || 'Max retries exceeded for CMAB request.')
       @logger.error(error_message)
       raise CmabFetchError, error_message
     end