kent-nguyen commented on a change in pull request #4422:
URL: https://github.com/apache/nifi/pull/4422#discussion_r459806345



##########
File path: 
nifi-nar-bundles/nifi-aws-bundle/nifi-aws-processors/src/main/java/org/apache/nifi/processors/aws/s3/PutS3Object.java
##########
@@ -152,6 +153,14 @@
         .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
         .build();
 
+    public static final PropertyDescriptor CACHE_CONTROL = new 
PropertyDescriptor.Builder()
+            .name("Cache Control")
+            .displayName("Cache Control")
+            .description("Sets the Cache-Control HTTP header. Multiple 
directives are comma-separated.")

Review comment:
       Hi @turcsanyip Thank you for checking my PR. It's great to hear you ran 
the tests on it. I had carefully tested it on my local too.
   
   In contrast to Content Type property, which can properly get MIME string 
from the flow file itself, the Cache Control is not relevant to flow file meta 
data, it is purely set to the processor itself.
   
   Other similar properties such as Storage Class, Server Side Encryption ... 
are purely set to the processor and does not support expression language either.
   
   I have updated the description as your suggestion. Thank you again.




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