header_max_count(name)
Return the maximum allowed number of headers named name.
Called when a header is added to a Message object. If the returned value is not 0 or None, and there are already a number of headers with the name name equal to the value returned, a ValueError is raised.
Because the default behavior of Message.__setitem__ is to append the value to the list of headers, it is easy to create duplicate headers without realizing it. This method allows certain headers to be limited in the number of instances of that header that may be added to a Message programmatically. (The limit is not observed by the parser, which will faithfully produce as many headers as exist in the message being parsed.)
The default implementation returns None for all header names.
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