class documentation

Like `environ_property` but for headers.

Method lookup Undocumented

Inherited from _DictAccessorProperty:

Method __delete__ Undocumented
Method __get__ Undocumented
Method __init__ Undocumented
Method __repr__ Undocumented
Method __set__ Undocumented
Instance Variable default Undocumented
Instance Variable dump_func Undocumented
Instance Variable load_func Undocumented
Instance Variable name Undocumented
Instance Variable read_only Undocumented