Syntax for ETag?

Question

Redbot reports that my webpage has invalid header:

The ETag header\'s syntax isn\'t valid.

My headers are set to:

Answer 1

"An ETag is an opaque identifier assigned by a web server to a specific version of a resource found at a URL". This means it can be pretty much anything.

The problem is probably the syntax, use:

ETag: "4ae413bd"