ETAG response header is missing
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Issue
- ETAG response header is missing on a page.
Resolution
If a page contains at least one non-cacheable portlet, - such as Asset Publisher -, the ETAG response header is not added by design.
The condition whether a portlet is cacheable or not is determined by the com.liferay.portlet.layout-cacheable property.
For example, the property by default is set to true for JournalContentPortlet (on the UI, referred as Web Content Display) and HelloWorldPortlet, but not defined - and therefore set by default as false - for AssetPublisherPortlet.
Any non-cacheable portlet on the page prevents adding the ETAG header to the response.
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