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Versions: 26
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Contents
/*!
* Ext JS Connect
* Copyright(c) 2010 Sencha Inc.
* MIT Licensed
*/
/**
* Conditional GET request support.
*
* @return {Function}
* @api public
*/
module.exports = function conditionalGet(){
return function conditionalGet(req, res, next) {
// Skip all requests that are not conditional gets.
if (!(req.method === "GET" &&
(req.headers["if-modified-since"] || req.headers["if-none-match"])
)) {
next();
return;
}
var since = req.headers["if-modified-since"],
oldEtag = req.headers["if-none-match"],
writeHead = res.writeHead,
write = res.write,
end = res.end;
since = since && Date.parse(since).valueOf();
res.writeHead = function (code, headers) {
var lastModified = headers["Last-Modified"],
etag = headers["Etag"];
lastModified = lastModified && Date.parse(lastModified).valueOf();
// If there is no match, then move on.
if (!(code === 200 &&
(lastModified === since || oldEtag === etag)
)) {
res.writeHead = writeHead;
res.writeHead(code, headers);
return;
}
// Ignore writes
res.write = function () {};
res.end = function () {
// Put the original functions back on.
res.writeHead = writeHead;
res.write = write;
res.end = end;
// Filter out any Content based headers since there is no
// content.
var newHeaders = {};
headers.forEach(function (value, key) {
if (key.indexOf("Content") < 0) {
newHeaders[key] = value;
}
});
res.writeHead(304, newHeaders);
res.end();
};
};
next();
};
};
Version data entries
26 entries across 26 versions & 1 rubygems