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BaseHeuristicc � � y)a!
Return a valid 1xx warning header value describing the cache
adjustments.
The response is provided too allow warnings like 113
http://tools.ietf.org/html/rfc7234#section-5.5.4 where we need
to explicitly say response is over 24 hours old.
z110 - "Response is Stale"� ��self�responses r �warningzBaseHeuristic.warning s � � +r c � � i S )z�Update the response headers with any new headers.
NOTE: This SHOULD always include some Warning header to
signify that the response was cached by the client, not
by way of the provided headers.
r r! s r �update_headersz BaseHeuristic.update_headers' s � � � r c �� � | j |� }|rK|j j |� | j |� }|� |j j d|i� |S )N�Warning)r& �headers�updater$ )r" r# �updated_headers�warning_header_values r �applyzBaseHeuristic.apply0 s] � � �-�-�h�7�� � � � � #� #�O� 4�#'�<�<��#9� �#�/�� � �'�'��4H�(I�J��r N�r# r
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Cache the response by providing an expires 1 day in the
future.
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c �$ � t di |��| _ y )Nr )r r )r" �kws r �__init__zExpiresAfter.__init__R s � � �_��_��
r c �H � t | j � }t |� dd�S )Nr> )r9 r? )r r r )r" r# r9 s r r& zExpiresAfter.update_headersU s � � �t�z�z�*��-�g�6��R�Rr c �$ � d}|| j z S )Nz:110 - Automatically cached for %s. Response might be stale)r )r" r# �tmpls r r$ zExpiresAfter.warningY s � �K���d�j�j� � r N)rD r r/ �Noner1 r. )r3 r4 r5 r@ rE r& r$ r r r rB rB M s � ��%�S�!r rB c �( � e Zd ZdZh d�Zdd�Zdd�Zy)� LastModifieda�
If there is no Expires header already, fall back on Last-Modified
using the heuristic from
http://tools.ietf.org/html/rfc7234#section-4.2.2
to calculate a reasonable value.
Firefox also does something like this per
https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching_FAQ
http://lxr.mozilla.org/mozilla-release/source/netwerk/protocol/http/nsHttpResponseHead.cpp#397
Unlike mozilla we limit this to 24-hr.
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