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/**
* Expose `fresh()`.
*/
module.exports = fresh;
/**
* Check freshness of `req` and `res` headers.
*
* When the cache is "fresh" __true__ is returned,
* otherwise __false__ is returned to indicate that
* the cache is now stale.
*
* @param {Object} req
* @param {Object} res
* @return {Boolean}
* @api public
*/
function fresh(req, res) {
// defaults
var etagMatches = true;
var notModified = true;
// fields
var modifiedSince = req['if-modified-since'];
var noneMatch = req['if-none-match'];
var lastModified = res['last-modified'];
var etag = res['etag'];
// unconditional request
if (!modifiedSince && !noneMatch) return false;
// parse if-none-match
if (noneMatch) noneMatch = noneMatch.split(/ *, */);
// if-none-match
if (noneMatch) etagMatches = ~noneMatch.indexOf(etag) || '*' == noneMatch[0];
// if-modified-since
if (modifiedSince) {
modifiedSince = new Date(modifiedSince);
lastModified = new Date(lastModified);
notModified = lastModified <= modifiedSince;
}
return !! (etagMatches && notModified);
}
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I currently hold the following qualifications (amongst others, I also studied Music Technology and Electronics, for my sins)
- MSc (Passed with distinctions), in Information Technology for E-Commerce
- BSc Hons (1st class) in Computer Science & Artificial Intelligence
Both of these at Sussex University UK.
Award(s)
I am lucky enough to have won a few awards for Zany Crazy code articles over the years
- Microsoft C# MVP 2016
- Codeproject MVP 2016
- Microsoft C# MVP 2015
- Codeproject MVP 2015
- Microsoft C# MVP 2014
- Codeproject MVP 2014
- Microsoft C# MVP 2013
- Codeproject MVP 2013
- Microsoft C# MVP 2012
- Codeproject MVP 2012
- Microsoft C# MVP 2011
- Codeproject MVP 2011
- Microsoft C# MVP 2010
- Codeproject MVP 2010
- Microsoft C# MVP 2009
- Codeproject MVP 2009
- Microsoft C# MVP 2008
- Codeproject MVP 2008
- And numerous codeproject awards which you can see over at my blog