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Much of this module is red-handedly pilfered from email.message in the stdlib,
so portions are Copyright (C) 2001,2002 Python Software Foundation, and were
written by Barry Warsaw.
Nz[ \(\)<>@,;:\\"/\[\]\?=]z[\x00-\x1F\x7F]z[\x00-\x08\x0A-\x1F\x7F] c C sR |dur't |dkr'|st|r!|dddd}d| |f S d| |f S | S ) z~Convenience function to format and return a key=value pair.
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zHeaders.setdefaultc K s g }|dur| j |dd}|| | D ],\}}| j |dd}|du r/||dd q| j |dd}|t|dd| q| j| j |ddd|f dS )af Extended header setting.
_name is the header field to add. keyword arguments can be used to set
additional parameters for the header field, with underscores converted
to dashes. Normally the parameter will be added as key="value" unless
value is None, in which case only the key will be added.
Example:
h.add_header('content-disposition', 'attachment', filename='bud.gif')
Note that unlike the corresponding 'email.message' method, this does
*not* handle '(charset, language, value)' tuples: all values must be
strings or None.
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