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sManage HTTP Response Headers

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.
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(dS(syDelete all occurrences of a header, if present.

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Get the first header value for 'name'

        Return None if the header is missing instead of raising an exception.

        Note that if the header appeared multiple times, the first exactly which
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Return a list of all the values for the named field.

        These will be sorted in the order they appeared in the original header
        list or were added to this instance, and may contain duplicates.  Any
        fields deleted and re-inserted are always appended to the header list.
        If no fields exist with the given name, returns an empty list.
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s:Get the first header value for 'name', or return 'default'(RR(RRtdefaultt
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Return a list of all the header field names.

        These will be sorted in the order they appeared in the original header
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        Any fields deleted and re-inserted are always appended to the header
        list.
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Return a list of all header values.

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Get all the header fields and values.

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        If there is no header named 'name', add a new header with name 'name'
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dS(sfExtended 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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