Returns a string representation for the given entity header.
Returns a string representation for the given entity header.
Returns a potential entity header for the given list of characters; None iff the given list is empty.
Returns a potential entity header for the given list of characters; None iff the given list is empty.
Returns a potential entity header for the given string; None iff the given string is empty.
Returns a potential entity header for the given string; None iff the given string is empty.