Jae Kwon

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<     If 'force' is False (the default), the following headers are checked:
<     'Etag', 'Last-Modified', 'Age', 'Expires'. If any are already present,
<     none of the above response headers are set.
---
>     If the response is cacheable (e.g. any of the following response headers exists:
>        'Etag', 'Last-Modified', 'Age', 'Expires') then the 'Expires' response
>        is set.
>     You can force this behavior (regardless of above condition) by setting Force=True.
>
>     Setting force to False will keep the tool from overwriting any headers
>     that are already present in the response.
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>     # is the response even cacheable?
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<     if not force:
<         # some header names that indicate that the response can be cached
<         for indicator in ('Etag', 'Last-Modified', 'Age', 'Expires'):
<             if indicator in headers:
<                 cacheable = True
<                 break
---
>     # some header names that indicate that the response can be cached
>     for indicator in ('Etag', 'Last-Modified', 'Age', 'Expires'):
>         if indicator in headers:
>             cacheable = True
>             break
>
>     # perhaps we're supposed to send no-cache headers?
>     no_cache = False
>     # some conditions that indicate that the response should be forcefully no-cached
>     if 'Cache-Control' in headers:
>         cache_control = headers['Cache-Control']
>         if cache_control.startswith('private') or cache_control.startswith('no-cache'):
>             no_cache = True
>         else:
>             pragma = headers['Pragma']
>             if pragma.startswith('no-cache'):
>                 no_cache = True
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<     if not cacheable:
---
>     if cacheable or no_cache or force:
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<         if secs == 0:
---
>         if secs == 0 or no_cache:
>             # do not cache, if possible expire early
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>             # otherwise set the expires header