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can you please link "cacheable status codes" to http://tools.ietf.org/html/rfc7231#page-48 ?
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oh, and travis noted that you have a spelling error: s/defaut/default/
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In that RFC, the list is longer: ‘e.g., 200, 203, 204, 206, 300, 301, 404, 405, 410, 414, and 501 in this specification’. Should we adhere to the RFC and cache those status code by default, too? So including 204 that caused confusion in #224.
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oh, indeed rfc2616 was more restrictive: http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.4
lets increase the default list but also fix the behaviour that invalidation is possible on any status < 400.