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z�Manage 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.
� Nz[ \(\)<>@,;:\\"/\[\]\?=]z[\x00-\x1F\x7F]� c C sx | d k rp t | � d k rp | s3 t j | � r_ | j d d � j d d � } d | | f Sd | | f Sn | Sd S) z~Convenience function to format and return a key=value pair.
This will quote the value if needed or if quote is true.
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zHeaders.__init__c C sP t | � t k r1 t j | � r- t d � � | St d j t | � � � � d S)zConvert/check value type.z)Control characters not allowed in headersz1Header names/values must be of type str (got {0})N)r �str�_control_chars_rer �
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| j | � S)aH 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
occurrence gets returned is undefined. Use getall() to get all
the values matching a header field name.
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r � __getitem__E s zHeaders.__getitem__c C s | j | � d k S)z/Return true if the message contains the header.N)r' )r r r
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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.
c s0 g | ]& } | d j � � k r | d � q S)r r )r" )r# r$ )r r
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)r r �get_allU s zHeaders.get_allc C sI | j | j � � } x- | j D]" \ } } | j � | k r | Sq W| S)z:Get the first header value for 'name', or return 'default')r r" r )r r �defaultr r r
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z Headers.getc C s d d � | j D� S)a* Return a list of all the header field names.
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list, or were added to this instance, and may contain duplicates.
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list.
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r �keysj s z Headers.keysc C s d d � | j D� S)a! Return a list of all header values.
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list, or were added to this instance, and may contain duplicates.
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list.
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r �valuest s zHeaders.valuesc C s | j d d � S)a Get all the header fields and values.
These will be sorted in the order they were in the original header
list, or were added to this instance, and may contain duplicates.
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list.
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suitable for direct HTTP transmission.z
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r � __bytes__� s zHeaders.__bytes__c C sO | j | � } | d k rG | j j | j | � | j | � f � | S| Sd S)z�Return first matching header value for 'name', or 'value'
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and value 'value'.N)r' r r r )r r r �resultr
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setdefault� s zHeaders.setdefaultc K s� g } | d k r. | j | � } | j | � x� | j � D]t \ } } | j | � } | d k r~ | j | j d d � � q; | j | � } | j t | j d d � | � � q; W| j j | j | � d j | � f � d S)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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