Add user feedback if an invalid Spring Expression is called

The Headless Server returns now error messages when an invalid Spring Expression was called from a fetch directive. It enables feedback whether or not an Expression is correct.

Follow Section, “Add user feedback if an invalid Spring Expression is called” for upgrade information.

(CMS-17418)

Updated blob cache configuration for headless

The configuration for the blobcache of headless-server was missing. Therefore defaults were used.

Follow Section, “Updated blob cache configuration for headless” for upgrade information.

(CMS-17111)

Handle Blobs and RichText in Structs

Blobs in Structs can be downloaded via the MediaController and Markup (RichText) in Structs is transformed correctly, including links.

Follow Section, “Handle Blobs and RichText in Structs” for upgrade information.

(CMS-16844)