Fix bug in Header Overflow risk due to not correctly appending TruncationMarker value when the Event Log exceeds the possible size that can be sent as GZipped (which is a rare edge case).

Author: cajuncoding

apachefop-serverless-az-func/src/main/java/com/cajuncoding/apachefop/serverless/web/ApacheFopServerlessResponseBuilder.java

@@ -110,7 +110,7 @@ public SafeHeader CreateSafeHeaderValue(String headerValue, int maxHeaderBytesSi
                 //Safely overwrite the last set of characters with the Truncation Marker...
                 truncatedValue = truncatedValue
                         .substring(0, truncatedValue.length() - TruncationMarker.length())
-                        .concat(truncatedValue);
+                        .concat(TruncationMarker);
 
                 resultValue = truncatedValue;
             }